| Is 270 over Old Farm Creek | 1958 | 265,320 | Fair |
| Is 270 over Tuckerman Lane | 1958 | 265,320 | Fair |
| Is 495 over Stoney Brook Dr Rock CR | 1964 | 242,821 | Fair |
| Is 495 over Md 650 | 1963 | 242,500 | Fair |
| Is 270 & Cd Rds over Watts Branch | 1955 | 239,460 | Fair |
| Is 495 over Kensington Pkwy | 1964 | 239,310 | Fair |
| Is 495 over Md 185 | 1964 | 239,310 | Fair |
| Is 495 over Potomac River | 1963 | 239,022 | Fair |
| Is 495 over Br of Rock Creek | 1958 | 238,050 | Fair |
| Is 495 over Cedar Lane | 1964 | 238,050 | Fair |
| Is 495 over Brunett Avenue | 1959 | 232,010 | Fair |
| Is 495 over Md 97 | 1960 | 232,010 | Good |
| Is 495 over Sligo Creek | 1960 | 232,010 | Fair |
| Is 495 over Sligo Creek Parkway | 1959 | 232,010 | Fair |
| Is 495 over Sligo Creek Trail | 2001 | 232,010 | Good |
| Is 495 over Clara Barton Parkway EB | 1963 | 228,218 | Fair |
| Is 495 over Northwest Branch | 1967 | 222,147 | Fair |
| Is 270 over Is 370 and Ramp B | 1989 | 216,270 | Fair |
| Is 495 & Ramp K(4) over Is 495X & C J CR | 1962 | 214,005 | Fair |
| Is 495 over Seven Locks Rd | 1962 | 214,005 | Fair |
| Is 495 over Macarthur Blvd Cb Pkwy | 1963 | 212,410 | Fair |
| Is 270 over Md 117 | 1954 | 171,940 | Fair |
| Is 270 over Gr Seneca CR & Game Pre | 1954 | 154,247 | Fair |
| Is 270 over Md 124 | 1955 | 154,247 | Fair |
| Is 270 over Middlebrook Road | 1990 | 133,720 | Fair |
| Is 270 Ramp C over Is 270Y Ramps B & B3 | 1958 | 130,450 | Fair |
| Is 495 Ol over Is 270Y | 1996 | 115,850 | Fair |
| Is 270Y Hov Ramp over Is 270Y Median | 2003 | 114,000 | Good |
| Is 495 over Md 187 (old Georgetown R | 1962 | 113,030 | Good |
| Is 270 over Little Seneca Creek | 1954 | 98,097 | Fair |
| Is 270 over West Old Baltimore Rd | 1954 | 98,097 | Fair |
| Is 270 Nbr over Br of Little Bennett Crk | 1952 | 94,940 | Fair |
| Is 370 & Ramp 9 over Csx/marc | 1989 | 87,390 | Good |
| Is 270 NB over Md 109 Little Bennett C | 1950 | 87,230 | Good |
| Is 270 SB over Md 109 Little Bennett C | 1950 | 87,230 | Good |
| Is 370 over Is 370 Ramp M | 1988 | 81,998 | Good |
| Is 370 over Md 355 | 1989 | 79,062 | Good |
| Is 370 EB over Is 370 Ramp B | 1989 | 78,741 | Fair |
| Is 370 Ebr over Crabbs Branch Way | 2010 | 78,741 | Good |
| Is 370 Wbr over Crabbs Branch Way | 2010 | 78,741 | Good |
| Is 370 over Oakmont Avenue | 1989 | 78,741 | Good |
| Md 200 over Mill Creek | 2008 | 68,500 | Good |
| Md 200 over Mill Creek Tributary | 2008 | 68,500 | Good |
| US 29 over Northwest Branch | 1920 | 67,927 | Fair |
| US 29 NB over Paint Branch | 1957 | 66,948 | Fair |
| US 29 SB over Paint Branch | 1957 | 66,948 | Fair |
| Montrose Road over Old Farm Creek | 2008 | 66,690 | Good |
| Md 200 (icc) over Rock Creek | 2010 | 62,479 | Good |
| US 29 over Md 650 | 1957 | 61,922 | Fair |
| Randolph Road over Northwest Branch | 1976 | 60,342 | Fair |
| Md 355 over Relocated Randolph Road | 2009 | 60,000 | Good |
| US 29 over Patuxent River | 1954 | 57,304 | Fair |
| Md 927 & Ramp D over Is 270 Ramp I | 1990 | 57,252 | Fair |
| US 29 over Is 495 | 1959 | 56,842 | Good |
| US 29 over Sligo Creek | 1936 | 55,302 | Fair |
| Md 355 NB over IS 495 IL & Ramp 5 | 1960 | 55,020 | Fair |
| Md 355 NB over Is 495 Ol | 1958 | 55,020 | Fair |
| Md 355 SB over Is 495 Il | 1959 | 55,020 | Fair |
| Md 355 SB over Is 495 Ol | 1959 | 55,020 | Fair |
| Md 355 SB over Md 355 Ramp 1 | 1959 | 55,020 | Fair |
| Shady Grove Road over Is 370 | 1989 | 53,010 | Good |
| US 29 Nbr over Md 198 | 2004 | 49,203 | Good |
| US 29 Sbr over Md 198 | 2002 | 49,203 | Good |
| Md 586 over Turkey Branch | 1955 | 47,792 | Fair |
| Md 28 & Ramp 6 over Watts Branch | 1955 | 47,601 | Fair |
| Md 28 over Br of Watts Branch | 1988 | 47,601 | Good |
| Md 97 (georgia Av) over Randolph Road | 2018 | 46,114 | Good |
| Md 187 over Is 270 | 2002 | 45,401 | Good |
| Is 270 SB over Is 495 Ol | 1990 | 44,696 | Fair |
| Md 190 over Booze Creek | 1962 | 44,290 | Fair |
| Md 193 over Is 495 | 1958 | 44,000 | Good |
| Md 185 over CSX Trans. | 1957 | 42,252 | Fair |
| Twinbrook Parkway over Csxt RR & Wmata Metro | 1964 | 41,919 | Fair |
| Md 586 over Rock Creek | 1954 | 41,271 | Fair |
| Md 185 over Rock Creek | 1957 | 40,845 | Fair |
| Shady Grove Road over Is 270 & C-d Roads | 1987 | 40,730 | Fair |
| Clara Barton Parkw over Clara Barton Parkway (SB | 1959 | 40,057 | Poor |
| Md 119 over Shady Branch | 1988 | 39,581 | Good |
| I-370 Wbr over Is-370 RP1 MD200 RP7 | 2010 | 39,531 | Good |
| Is-370 Ebr over Is-370 RP1 MD200 RP7 | 2010 | 39,531 | Good |
| Nicholson Lane over Csxt Railroad | 2008 | 38,971 | Fair |
| Md 185 over Br of Rock Creek | 1963 | 38,552 | Fair |
| Shady Grove Road over Mill Creek | 1975 | 37,762 | Fair |
| Md 586 over Branch of Rock Creek | 1956 | 37,752 | Fair |
| Md 185 over Proposed Roadway | 1968 | 36,532 | Fair |
| Md 185 over Turkey Branch | 1969 | 36,532 | Fair |
| Md 929A & Md 929B over US 29 | 2006 | 36,072 | Good |
| Md 929A over US 29 Future Ramp E | 2004 | 36,072 | Fair |
| Shady Grove Rd WB over Csxt Railroad | 1976 | 35,374 | Fair |
| Md 390 over CSX Transportation | 1958 | 35,062 | Good |
| Md 355 over CSX Trans Mu 681 Mu 77 | 1987 | 34,970 | Fair |
| Md 119 over Muddy Branch | 1988 | 34,401 | Good |
| Md 28 over Branch of Rock Creek | 1969 | 34,390 | Fair |
| Sam Eig Highway over Muddy Branch Tributary | 1991 | 34,353 | Good |
| East Randolph Road over Paint Branch | 1963 | 34,092 | Fair |
| Father Hurley Boul over Little Seneca Creek Trib | 1995 | 33,220 | Poor |
| Md 650 over Sligo Creek | 1935 | 33,100 | Fair |
| Md 200 (icc) EB over Bonifant Rd & NW Br | 2010 | 32,786 | Good |
| Md 200 (icc) EB over Northwest Branch | 2010 | 32,786 | Good |
| Md 200 (icc) EB over Northwest Branch | 2010 | 32,786 | Good |
| Md 200 (icc) WB over Bonifant Rd & NW Branch | 2010 | 32,683 | Good |
| Md 200 (icc) WB over Northwest Branch | 2010 | 32,683 | Good |
| Md 200 (icc) WB over Northwest Branch | 2010 | 32,683 | Good |
| Md 200 (icc) WB over Good Hope Tributary | 2010 | 32,064 | Good |
| Md 200 (icc) WB over Paint Branch | 2010 | 32,064 | Good |
| Democracy Boulevar over Cabin John Creek | 1967 | 31,775 | Fair |
| Md 200 (icc) EB over Good Hope Tributary | 2010 | 31,755 | Good |
| Md 200 (icc) EB over Gum Springs & Paint Bran | 2010 | 31,755 | Good |
| Md 200 (icc) EB over North Branch Rock Creek | 2010 | 31,652 | Fair |
| Md 200 (icc) EB over Shady Grove Road | 2010 | 31,652 | Good |
| Md 200 (icc) EB over Tributary of Nbrc | 2010 | 31,652 | Good |
| New Hampshire Ave over Md 200 (icc) | 2010 | 31,575 | Good |
| Md 355 over Great Seneca Creek | 1999 | 31,050 | Good |
| Md 200 (icc) WB over North Branch Rock Creek | 2010 | 30,827 | Fair |
| Md 200 (icc) WB over Shady Grove Road | 2010 | 30,827 | Good |
| Md 200 (icc) WB over Tributary of Nbrc | 2010 | 30,827 | Good |
| West Gude Drive over I-270 | 1985 | 30,343 | Poor |
| Seven Locks Road over Cabin John Creek | 1960 | 30,260 | Fair |
| Wisconsin Avenue over Bethesda Metro Ped. Tunn | 1984 | 29,515 | Good |
| Montgomery Village over Cabin Branch | 1972 | 29,148 | Fair |
| Montgomery Village over North Creek | 1972 | 29,148 | Good |
| Montrose Parkway over Old Farm Creek | 2007 | 28,776 | Good |
| Montrose Parkway over Old Farm Creek Tributary | 2006 | 28,776 | Fair |
| Md 118 over Is 270 | 1954 | 28,651 | Good |
| Md 355 over Capital Crescent Trail | 1988 | 28,620 | Fair |
| Md 193 over Sligo Creek | 1932 | 28,580 | Fair |
| Md 97 SB over Md 200 (icc) | 2010 | 27,660 | Good |
| Md 28 over Csxt Wmata Ramp | 1981 | 27,020 | Fair |
| Md 410 over Branch of Rock Creek | 1929 | 26,931 | Fair |
| Goshen Road over Whetstone Run Tributary | 1930 | 26,801 | Fair |
| Wootton Parkway over Cabin John Creek | 1991 | 26,366 | Fair |
| Md 28 over Is 270 & C-d Roads | 1955 | 26,090 | Fair |
| Md 410 over Georgetown Branch Trail | 1997 | 26,061 | Good |
| Democracy Blvd over Is 270Y | 2003 | 25,601 | Good |
| Goshen Road over Cabin Branch | 2004 | 25,587 | Good |
| Md 118 over CSX Transportation | 1998 | 25,451 | Good |
| Md 28 WB over Rock Creek | 1970 | 24,840 | Fair |
| Muddy Branch Road over Muddy Branch | 1987 | 24,785 | Fair |
| Md 28 over Muddy Branch | 2004 | 24,594 | Good |
| Tuckerman Lane over Cabin John Creek | 1966 | 24,539 | Fair |
| Md 28 over Batchellors Run | 1999 | 24,340 | Good |
| Md 124 over Whetstone Run | 1991 | 23,940 | Good |
| East Gude Drive (E over Csxt RR & Wmata Metro | 1989 | 23,921 | Fair |
| East Gude Drive (W over Csxt RR & Wmata Metro | 1968 | 23,918 | Fair |
| Md 28 EB over Rock Creek | 1970 | 23,866 | Fair |
| Md 124 over Whetstone Run | 1986 | 23,621 | Fair |
| Crabbs Branch Way over Metro Access Road | 1983 | 23,523 | Fair |
| Randolph Road (EB) over Rock Creek | 1953 | 23,434 | Fair |
| Randolph Road (WB) over Rock Creek | 1951 | 23,434 | Fair |
| Md 97 NB over Md 200 (icc) | 2010 | 23,218 | Good |
| Md 200 (icc) EB over Ramp NW | 2011 | 22,682 | Good |
| Bel Pre Road over Bel Pre Creek | 1955 | 22,635 | Fair |
| Montrose Road over Ramp to I-270 | 1990 | 22,375 | Good |
| Wootton Parkway over Cabin John Creek Tributa | 1991 | 22,236 | Fair |
| Is 495X SB over Cabin John Creek | 1964 | 22,160 | Fair |
| Md 190 over Little Falls | 1962 | 22,152 | Good |
| Md 108 over Trib to James Creek | 1994 | 22,100 | Good |
| Md 190 over Cabin John Creek | 1974 | 22,022 | Fair |
| Md 190 over Is 495 | 1962 | 22,022 | Fair |
| Md 28 over Buckhorn Run | 2001 | 21,671 | Good |
| Md 200 (icc) WB over Ramp NW | 2011 | 21,574 | Good |
| Md 200 (icc) WB over US 29 & Ramp SE NB&EB | 2011 | 21,574 | Good |
| Md 200 (icc) EB over US 29 & Ramp SE NB&EB | 2011 | 21,522 | Good |
| Deer Ridge Road over Md 119 | 1989 | 21,111 | Fair |
| Md 182 over Bel Pre Creek | 1991 | 21,002 | Fair |
| Goshen Road over Whetstone Run | 1986 | 20,972 | Fair |
| Norbeck Rd & Norwo over Northwest Branch | 2002 | 20,695 | Good |
| Redland Road over Csxt RR & Wmata Metro | 1980 | 20,246 | Fair |
| Md 410 over Rock Creek | 1974 | 20,224 | Fair |
| Airpark Road over Rock Creek Tributary | 1994 | 20,070 | Fair |
| Tuckerman Lane over Snakeden Branch | 1966 | 19,882 | Poor |
| Is 495X NB over Cabin John Creek | 1963 | 19,820 | Fair |
| Is 495X over Booze Creek | 1964 | 19,820 | Fair |
| Is 495X over Cabin John Creek | 1964 | 19,820 | Fair |
| Muncaster Mill Rd over Md 200 (icc) | 2010 | 19,690 | Good |
| Shady Grove Rd EB over Csxt Railroad | 1976 | 19,679 | Poor |
| Brookville Road over Csxt Railroad | 1976 | 19,611 | Fair |
| Md 119 over Shady Branch | 1988 | 19,551 | Fair |
| Wayne Avenue over Sligo Creek | 1960 | 19,450 | Good |
| Wootton Parkway over I-270 | 1990 | 19,444 | Fair |
| Md 320 over Sligo Creek | 1920 | 19,392 | Fair |
| Md 187B (rockledge over 1S 270 | 2002 | 19,205 | Good |
| Norbeck Road over Nursery Run | 2002 | 18,960 | Good |
| Md 117 over Great Seneca Creek | 1951 | 18,752 | Fair |
| Md 117 over Gunners Branch | 1951 | 18,752 | Fair |
| Norbeck Rd (MD28) over Md 200 (icc) | 2010 | 18,475 | Good |
| Briggs Chaney Road over Md 200 (icc) | 2011 | 18,193 | Fair |
| Seven Locks Road over Cabin John Creek Tributa | 1965 | 18,184 | Poor |
| Midcounty Hwy & Mi over Mill Creek | 1984 | 17,842 | Poor |
| Little Falls Parkw over Willet Branch | 1958 | 17,373 | Fair |
| Little Falls Parkw over Willet Branch | 1963 | 17,283 | Fair |
| Md 115 over North Br of Rock Creek | 1917 | 16,981 | Fair |
| Md 115 over Rock Creek | 1970 | 16,981 | Fair |
| Briggs Chaney Road over Little Paint Branch Trib | 1994 | 16,939 | Fair |
| Little Falls Parkw over Willet Branch | 1958 | 16,840 | Fair |
| Democracy Boulevar over Buck Branch Tributary | 1989 | 16,800 | Fair |
| Southlawn Lane over Rock Creek | 1920 | 16,792 | Poor |
| Democracy Boulevar over Buck Branch | 1988 | 16,780 | Fair |
| Little Falls Parkw over Little Falls Branch Trib | 1980 | 16,691 | Fair |
| Crabbs Branch Way over Crabbs Creek | 1982 | 16,564 | Fair |
| Brink Road over Great Seneca Creek | 1936 | 16,456 | Poor |
| Macarthur Boulevar over Capital Crescent Trail | 1910 | 16,435 | Fair |
| Fernwood Rd over Is 495 | 1962 | 16,350 | Fair |
| Co 141 (middlebroo over Gunners Branch | 1959 | 16,296 | Good |
| Clara Barton Parkw over Cabin John Creek & Cabin | 1963 | 16,120 | Fair |
| Clara Barton Parkw over Little Falls Branch | 1961 | 16,120 | Fair |
| Clara Barton Parkw over Riverside Drive | 1961 | 16,120 | Fair |
| Ericsson Road over Clara Barton Parkway | 1962 | 16,120 | Poor |
| Muddy Branch Road over Shady Branch | 1987 | 15,653 | Fair |
| Md 396 over Little Falls Branch | 1931 | 15,581 | Fair |
| Is 270 Ramp C(5) over Is 270; C-d Rds & Rp F/1 | 1990 | 15,251 | Fair |
| Is 270 Ramp C(5) over Is 370 & Ramp B | 1988 | 15,251 | Good |
| Md 190 over Watts Branch | 1949 | 15,240 | Fair |
| Wootton Parkway over Watts Branch | 1972 | 14,951 | Fair |
| Muddy Branch Rd EB over Is 270 & NB C-d Road | 1989 | 14,642 | Good |
| Muddy Branch Rd WB over Is 270 & NB C-d Road | 1989 | 14,642 | Good |
| Layhill Rd (MD182) over Md 200 (icc) | 2010 | 14,607 | Good |
| Wootton Parkway over Watts Branch Tributary | 1971 | 14,464 | Fair |
| Father Hurley Boul over Century Boulevard | 1995 | 14,319 | Good |
| Father Hurley Boul over I-270 | 1995 | 14,319 | Good |
| Is 370 Ramp F over Is 370 | 1989 | 14,302 | Good |
| Briggs Chaney Road over Paint Branch | 1974 | 13,855 | Fair |
| Md 355 over Little Seneca Creek | 1922 | 13,820 | Fair |
| Md 121 over Is 270 | 1997 | 13,714 | Good |
| Father Hurley Boul over Century Boulevard | 1995 | 13,713 | Good |
| Father Hurley Boul over I-270 | 1995 | 13,713 | Good |
| Is 495 Ramp E(10) over Cabin John Creek | 1964 | 13,610 | Fair |
| Brink Road over Goshen Branch Tributary | 2007 | 13,608 | Good |
| Is 370 Ramp F(1) over Is 270 C-d Rds & Rp C/5 | 1989 | 13,596 | Fair |
| Westlake Terrace-f over I-270 | 1994 | 13,584 | Fair |
| Nelson Street over Watts Branch | 1955 | 13,576 | Fair |
| Cedar Lane over Rock Creek | 1959 | 13,424 | Good |
| Md 195 over Long Branch | 2005 | 13,190 | Good |
| Clara Barton Pkwy over Rock Run | 1963 | 13,090 | Fair |
| Md 108 over Patuxent River | 1928 | 12,871 | Fair |
| Watkins Mill Road over Cabin Branch | 1990 | 12,768 | Fair |
| Watkins Mill Road over Great Seneca Creek | 1990 | 12,760 | Good |
| Redland Road over Md 200 (icc) | 2009 | 12,649 | Good |
| Tower Oaks Bouleva over Cabin John Creek | 1975 | 12,480 | Fair |
| Forest Glen Road over Sligo Creek | 1974 | 12,353 | Fair |
| Macarthur Blvd. over Cabin John Creek | 1863 | 12,300 | Fair |
| Fairland Road over Paint Branch | 1965 | 12,190 | Fair |
| Bonifant Road over Northwest Branch | 1971 | 12,165 | Fair |
| Glen Mill Road over Piney Branch | 1960 | 12,144 | Fair |
| Md 124 over Great Seneca Creek | 1989 | 11,881 | Fair |
| Forest Glen Road over Is 495 | 1964 | 11,684 | Fair |
| Observation Drive over Little Seneca Creek | 1994 | 11,584 | Good |
| Md 124 over Goshen Branch | 1989 | 11,560 | Fair |
| Md 28 over Seneca Creek | 2000 | 11,520 | Good |
| Md 410 over Csxt Wmata | 1975 | 11,472 | Fair |
| Is 270 Ramp A(6) over Is 495 Ol | 1990 | 11,255 | Fair |
| Briggs Chaney Road over US 29 | 2007 | 11,212 | Good |
| Md 547 over Rock Creek | 1932 | 10,982 | Fair |
| Dennis Avenue over Sligo Creek | 1999 | 10,971 | Fair |
| Greentree Road over Bulls Run | 1949 | 10,816 | Poor |
| Md 119 over Great Seneca Creek | 1989 | 10,766 | Good |
| Md 119 over Long Draught Branch | 1990 | 10,766 | Fair |
| Md 97 over Hawlings River | 1930 | 10,740 | Fair |
| Md 97 over Reddy Branch | 1927 | 10,740 | Fair |
| Edmonston Drive over Csxt RR & Wmata Metro | 1981 | 10,524 | Fair |
| Bowie Mill Road over Rock Creek North Branch | 1959 | 10,400 | Fair |
| Md 97 over Meadow Branch | 2021 | 10,400 | Good |
| Md 97 over Reddy Branch | 2022 | 10,400 | Good |
| Md 191 over Is 495 & Thomas Branch | 1962 | 10,370 | Fair |
| Md 119 over Great Seneca Creek | 1989 | 10,344 | Good |
| Md 119 over Long Draught Branch | 1990 | 10,344 | Good |
| Md 927-montrose Rd over Is 270 & C-d Roads | 1988 | 10,211 | Fair |
| Is 270 Ramp A 1 over Is 270 Ramp B | 1995 | 10,196 | Good |
| Washingtonian Boul over Sam Eig Highway | 1998 | 9,998 | Good |
| Md 182 over Batchellors Run | 1931 | 9,850 | Fair |
| Md 182 over Buckhorn Br | 1931 | 9,850 | Fair |
| Summit Avenue over Csxt Railroad | 1996 | 9,746 | Good |
| Old Columbia Pike over MD-200 & Ramps SW & EN | 2011 | 9,633 | Good |
| Bureau Drive over Long Draught Branch | 1982 | 9,562 | Fair |
| Seven Locks Road over Cabin John Creek | 1980 | 9,414 | Fair |
| Redland Road over Crabbs Creek | 1981 | 9,310 | Fair |
| Md 189 over Is 270 & C-d Roads | 1988 | 9,304 | Fair |
| Centerway Road over Cabin Branch Tributary | 1971 | 9,298 | Good |
| Seminary Road over Is 495 | 1964 | 9,275 | Good |
| Beach Drive over Rock Creek Tributary | 1968 | 8,841 | Fair |
| Beach Drive over Rock Creek Tributary | 1968 | 8,841 | Fair |
| Is 495 Ramp K(4) over Is 495X Nbr | 1962 | 8,755 | Good |
| Beach Drive over Rock Creek | 1962 | 8,742 | Fair |
| Beach Drive over Rock Creek | 1966 | 8,663 | Fair |
| Beach Drive over Rock Creek Tributary | 1965 | 8,611 | Fair |
| Beach Drive over Silver Creek | 2022 | 8,611 | Good |
| Greentree Rd over Is 495 | 1962 | 8,600 | Fair |
| Dennis Avenue over Sligo Creek Tributary | 1961 | 8,590 | Poor |
| Lyttonsville Place over Purple Line | 2019 | 8,542 | Good |
| Md 191 over Cabin John Creek | 1991 | 8,530 | Fair |
| Kemp Mill Road over Northwest Branch Tributa | 1964 | 8,485 | Fair |
| Watkins Mill Road over Whetstone Run | 1997 | 8,397 | Good |
| Spring Street over Csxt RR & Wmata Metro | 1968 | 8,204 | Poor |
| Emory Lane over Md 200 (icc) | 2010 | 8,133 | Good |
| Glen Road over Watts Branch | 1930 | 8,114 | Fair |
| Muncaster Road over Rock Creek | 2006 | 7,803 | Good |
| Md 650 over Hawlings River | 1929 | 7,660 | Fair |
| Md 355 over Little Bennett Creek | 1925 | 7,540 | Good |
| Md 195 over Sligo CR Pkwy & Sligo CR | 1932 | 7,500 | Good |
| Baltimore Road over Rock Creek | 1911 | 7,482 | Fair |
| Md 117 over Little Seneca Creek | 1953 | 7,457 | Fair |
| Richter Farm Road over Little Seneca Creek Trib | 2000 | 7,433 | Fair |
| Jones Mill Road over Coquelin Run | 1949 | 7,307 | Fair |
| Md 109 over Little Bennett Creek | 1951 | 7,232 | Fair |
| Jones Mill Road over Purple Line / Capital CR | 2024 | 7,194 | Good |
| Jones Mill Road over Rock Creek | 1969 | 7,194 | Fair |
| Stringtown Road over Little Seneca Creek Trib | 2017 | 7,151 | Fair |
| East Deer Park Dri over Csxt Railroad | 1945 | 7,121 | Fair |
| Crystal Rock Drive over Little Seneca Creek Trib | 1988 | 7,114 | Fair |
| Brighton Dam Road over Brighton Dam & Triadelph | 1944 | 7,106 | Fair |
| Snouffer School Ro over Cabin Branch | 2020 | 7,060 | Good |
| Is 495 SE Ramp over Clara Barton Pky & Canal | 1963 | 7,021 | Fair |
| Is 495 Ramp over Clara Barton Pkwy Wbr | 1963 | 7,000 | Fair |
| Is 270 Ramp L(1) over Gunners Branch | 1989 | 6,945 | Good |
| Waring Station Roa over Csxt Railroad | 1986 | 6,897 | Fair |
| Longmead Crossing over Md 200 (icc) | 2010 | 6,790 | Good |
| Beach Drive over Rock Creek | 1968 | 6,789 | Fair |
| Piney Meetinghouse over Watts Branch | 2017 | 6,724 | Good |
| Stoneybrook Drive over Csxt Railroad | 2001 | 6,654 | Good |
| Tilden Lane over Old Farm Creek | 1972 | 6,533 | Fair |
| Needwood Road over Rock Creek | 1965 | 6,446 | Fair |
| Centurion Way over Sandy Branch | 2000 | 6,433 | Good |
| Snowden Farm Parkw over Little Seneca Creek | 2011 | 6,303 | Good |
| Snouffer School Ro over Cabin Branch | 2020 | 6,239 | Good |
| Scott Drive over Watts Branch | 1990 | 6,213 | Fair |
| Md 118 over Great Seneca Creek | 1931 | 6,121 | Fair |
| Maple Avenue over Sligo Creek | 1930 | 6,024 | Fair |
| Spartan Road over James Creek Tributary | 1990 | 6,004 | Fair |
| Ramp EN over MD 200 (ICC) US29 Rp SE | 2011 | 5,902 | Good |
| Fallsgrove Drive over Watts Branch Tributary | 2003 | 5,896 | Fair |
| Sligo Creek Parkwa over Sligo Creek Tributary | 1996 | 5,886 | Fair |
| Cashell Road over Williamsburg Run | 1972 | 5,865 | Fair |
| Md 107 over Dry Seneca Creek | 1992 | 5,862 | Fair |
| Hurley Avenue over Watts Branch Tributary | 1969 | 5,815 | Poor |
| Decoverly Drive over Muddy Branch Tributary | 2006 | 5,804 | Fair |
| Md 117 over Bucklodge Branch | 1932 | 5,572 | Fair |
| Is 495 Ramp F(1) over Is 495 | 1964 | 5,541 | Fair |
| Skylark Road over Little Seneca Creek | 2006 | 5,507 | Fair |
| Md 28 over Br of Dry Seneca Creek | 1954 | 5,420 | Fair |
| Md 119 over Gunners Br Csxt RR | 1987 | 5,366 | Good |
| Talbot Avenue over Lrt and Csxt Railroad | 2024 | 5,320 | Good |
| Ednor Road over Northwest Branch | 1990 | 5,308 | Fair |
| Quince Orchard Roa over Muddy Branch | 1965 | 5,297 | Poor |
| Morningwood Drive over Williamsburg Run Tributa | 1970 | 5,113 | Fair |
| Md 28 over Little Monocacy River | 1925 | 5,050 | Fair |
| Md 119 over Gunners Br Csxt RR | 1987 | 5,034 | Good |
| Notley Road over Md 200 (icc) | 2010 | 4,997 | Good |
| Oaklyn Drive over Rock Run | 1989 | 4,934 | Fair |
| Glen Road over Piney Branch | 1935 | 4,689 | Fair |
| Kensington Parkway over Silver Creek | 1940 | 4,601 | Fair |
| Russett Road over Rock Creek Tributary | 1966 | 4,597 | Fair |
| Sundown Road over Hawlings River | 1996 | 4,567 | Good |
| Grosvenor Lane over Is 270 | 1958 | 4,422 | Fair |
| Snowden Farm Parkw over Little Seneca Creek Trib | 2011 | 4,305 | Good |
| Clarksburg Road over Little Bennett Creek Tri | 1988 | 4,210 | Good |
| Clarksburg Road over Little Bennett Creek | 1998 | 4,194 | Good |
| Riffle Ford Road over Great Seneca Creek | 1952 | 4,131 | Fair |
| Clarksburg Road over Bennett Creek | 2011 | 4,123 | Good |
| Clarksburg Road over Bennett Creek Tributary | 2003 | 4,123 | Good |
| Linden Lane over Csxt Railroad | 1996 | 4,090 | Good |
| I-370 Ramp - B over Crabbs Branch Way | 2009 | 3,953 | Good |
| I-370 Ramp L(7) over I-370 Ramp M(3) | 2010 | 3,953 | Good |
| Diamondback Drive over Muddy Branch Tributary | 1995 | 3,932 | Good |
| Cavanaugh Drive over Piney Branch | 1993 | 3,929 | Fair |
| Avery Road over Rock Creek | 1994 | 3,894 | Good |
| Kensington Parkway over Rock Creek | 1910 | 3,813 | Fair |
| Century Boulevard over Little Seneca Creek Trib | 2014 | 3,720 | Good |
| Watts Branch Parkw over Watts Branch | 1970 | 3,704 | Good |
| Is 495 Ramp E over Kensington Pkwy | 1964 | 3,685 | Fair |
| Peach Orchard Road over Paint Branch | 1990 | 3,677 | Fair |
| Monroe Street over Truck Street | 1996 | 3,663 | Fair |
| Esworthy Road over Muddy Branch | 1999 | 3,639 | Good |
| Old Baltimore Road over James Creek | 1998 | 3,623 | Good |
| Md 190 over Muddy Branch | 1954 | 3,592 | Fair |
| Md 121 over Little Seneca Lake | 1984 | 3,571 | Fair |
| Garrett Park Road over Rock Creek | 1965 | 3,554 | Poor |
| Foreman Boulevard over Little Seneca Creek Trib | 2011 | 3,500 | Good |
| First Street over Rock Creek Tributary | 2017 | 3,496 | Good |
| Old Baltimore Road over James Creek Tributary | 1985 | 3,494 | Fair |
| Serpentine Way over Paint Branch Tributary | 1975 | 3,476 | Good |
| Kent Street over Silver Creek | 1940 | 3,460 | Fair |
| Victory Farm Drive over Whetstone Run Tributary | 1981 | 3,395 | Good |
| River Road over Seneca Creek | 1959 | 3,284 | Fair |
| Old Baltimore Road over James Creek Tributary | 1998 | 3,273 | Fair |
| Longdraft Road over Long Draught Branch | 1977 | 3,200 | Good |
| Hawkins Creamery R over Great Seneca Creek | 1961 | 3,045 | Fair |
| Inwood Avenue over Sligo Creek Tributary | 1956 | 2,972 | Good |
| Glen Road over Kilgour Branch | 1942 | 2,961 | Fair |
| Persimmon Tree Rd over Is 495 | 1961 | 2,910 | Fair |
| Preserve Parkway over Cabin John Creek Tributa | 1999 | 2,840 | Good |
| Gold Mine Road over Hawlings River | 2019 | 2,792 | Good |
| Palmer Road South over E Palmer Rd Stoney Creek | 1981 | 2,750 | Fair |
| Palmer Road South over Stone Lake Rd/parking Lt | 1981 | 2,750 | Fair |
| Fda Boulevard over Paint Branch Tributary | 2010 | 2,710 | Good |
| Ramp WS & WN over Ramp NW | 2011 | 2,706 | Good |
| Persimmon Tree Roa over Congressional Cc Underpa | 1977 | 2,685 | Fair |
| Little Seneca Park over Little Seneca Creek | 2014 | 2,560 | Good |
| Little Seneca Park over Little Seneca Creek Trib | 2011 | 2,560 | Good |
| Comus Road over Is 270 | 1952 | 2,540 | Fair |
| Preserve Parkway over Cabin John Creek | 2006 | 2,450 | Fair |
| MD 200 (ICC) Ramp over MD 200 (ICC) Ramp SE | 2010 | 2,449 | Good |
| MD 200 Ramp ES over MD 200 (ICC) Ramp SB | 2010 | 2,449 | Good |
| Ramp ES over Ramp SE | 2011 | 2,449 | Good |
| Ambleside Drive over Watts Branch | 1970 | 2,418 | Fair |
| Ramp Ws over MD 200/US29 Ramp EB | 2011 | 2,397 | Good |
| West Old Baltimore over Little Seneca Creek | 1934 | 2,361 | Fair |
| Partnership Road over Russell Branch | 1920 | 2,298 | Fair |
| Ramp NW to MD200WB over US29 Ramp NB&SE MD200 | 2011 | 2,294 | Good |
| West Old Baltimore over Cabin Branch | 2016 | 2,221 | Good |
| Watkins Mill Road over CSX Railroad | 2006 | 2,136 | Good |
| Whites Ferry Road over Broad Run Tributary | 1998 | 2,101 | Good |
| Game Preserve Road over Whetstone Run | 1990 | 2,086 | Fair |
| Carderock Access C over Clara Barton Parkway | 1962 | 2,000 | Fair |
| Stokes Road over Stoney Creek | 1950 | 2,000 | Fair |
| Whites Ferry Road over Broad Run | 1931 | 1,988 | Fair |
| Game Preserve Road over Whetstone Run | 1990 | 1,982 | Good |
| Burning Tree Road over Booze Creek | 2008 | 1,938 | Good |
| Whites Ferry Road over Broad Run Tributary | 2014 | 1,907 | Good |
| Whites Ferry Road over Broad Run Tributary | 2014 | 1,836 | Good |
| Flower Avenue over Sligo Creek | 1930 | 1,774 | Fair |
| Bethesda Church Ro over Bennett Creek | 1990 | 1,771 | Fair |
| Dorset Avenue over Willett Branch | 1999 | 1,744 | Good |
| Md 109 over Br of Little Monocacy Ri | 2003 | 1,732 | Good |
| Logan Drive over Rock Run | 1972 | 1,657 | Fair |
| Turkey Foot Road over Muddy Branch | 1968 | 1,453 | Fair |
| Is 495 NW Ramp over Macarthur Boulevard | 1963 | 1,330 | Fair |
| Rabbitt Road over Long Draught Branch | 1982 | 1,329 | Poor |
| Martinsburg Road over Potomac River Tributary | 1925 | 1,322 | Fair |
| Cattail Road over Dry Seneca Creek | 1975 | 1,239 | Fair |
| Long Corner Road over Patuxent River | 1968 | 1,216 | Fair |
| Park Valley Road over Sligo Creek | 2019 | 1,126 | Good |
| Indianola Drive over Csxt RR & Wmata Metro | 1981 | 1,075 | Fair |
| Zion Road over Hawlings River | 1930 | 1,075 | Poor |
| Olde Mill Run Road over MD200 (icc) | 2010 | 1,073 | Good |
| Jerusalem Road over Dry Seneca Creek | 2013 | 1,043 | Good |
| Bexhill Drive over Silver Creek | 1985 | 1,029 | Fair |
| Haviland Mill Road over Hawlings River | 1926 | 1,000 | Fair |
| Dustin Road over US 29 | 2003 | 999 | Good |
| Industrial Drive over Is 370 | 1989 | 999 | Good |
| Greenway Drive over Little Falls Branch | 1962 | 970 | Fair |
| Barnesville Road over Little Monocacy River | 1940 | 918 | Fair |
| Rannoch Road over Minnehaha Branch | 1920 | 897 | Fair |
| Dayton Street over Sligo Creek Tributary | 1965 | 836 | Fair |
| Berryville Road over Seneca Creek Tributary | 1930 | 821 | Fair |
| Long Corner Road over Patuxent River Tributary | 1970 | 821 | Fair |
| Needwood Road over Md 200 (icc) | 2010 | 760 | Good |
| Goldleaf Drive over Minnehaha Branch | 1985 | 759 | Fair |
| Brighton Dam Road over Reddy Branch | 1910 | 743 | Fair |
| Brighton Dam Road over Hawlings River | 1920 | 740 | Fair |
| Elmhirst Parkway over Rock Creek Tributary | 2016 | 718 | Good |
| Hipsley Mill Road over Patuxent River | 1973 | 716 | Fair |
| Valleywood Drive over Josephs Branch | 1960 | 706 | Poor |
| Wickham Road over Rock Creek North Branch | 2002 | 684 | Good |
| White Ground Road over Bucklodge Branch | 2012 | 654 | Good |
| White Ground Road over Seneca Creek Tributary | 1925 | 615 | Fair |
| Howard Chapel Road over Haights Branch | 1963 | 609 | Fair |
| Howard Chapel Road over Patuxent River | 2002 | 609 | Good |
| Barnes Road over Bennett Creek | 1925 | 608 | Poor |
| Father Hurley Boul over Csxt Railroad | 2010 | 588 | Good |
| Laurie Drive over Hollywood Branch | 1965 | 575 | Fair |
| Kendale Road over Ken Branch | 2002 | 571 | Fair |
| Club Hollow Road over Broad Run | 1930 | 540 | Fair |
| Brimstone Academy over James Creek Tributary | 1988 | 539 | Fair |
| Pennyfield Lock Ro over Unnamed Tributary | 2017 | 529 | Good |
| George Washington over North Branch Rock Creek | 1973 | 518 | Fair |
| Pyrite Lane over James Creek | 2005 | 518 | Good |
| Potomac Crest Driv over Snakeden Branch | 1995 | 513 | Good |
| E. Rixey Road over Stoney Creek | 1975 | 500 | Fair |
| East Montgomery Ro over Rockville Center Multipl | 1998 | 500 | Fair |
| Witex Road over Rock Run | 1980 | 500 | Poor |
| Carnation Drive over Watts Branch Tributary | 1969 | 490 | Good |
| Huntmaster Road over Goshen Branch | 1920 | 480 | Fair |
| Sugarland Road over Dry Seneca Creek | 1971 | 455 | Fair |
| Wildcat Road over Wildcat Branch | 1935 | 445 | Fair |
| River Road over Broad Run | 1911 | 444 | Fair |
| Schaeffer Road over Little Seneca Creek | 1925 | 437 | Poor |
| Peach Tree Road over Csxt Railroad | 2000 | 428 | Good |
| Granite Rock Road over Little Seneca Creek Trib | 2007 | 425 | Fair |
| Black Rock Road over Great Seneca Creek | 1965 | 400 | Fair |
| Wickham Road over Rock Creek North Branch | 2002 | 376 | Good |
| Mouth of Monocacy over Csxt Railroad | 2007 | 365 | Good |
| Purdum Road over Bennett Creek Tributary | 1975 | 354 | Fair |
| Big Woods Road over Little Monocacy River | 1919 | 345 | Fair |
| Middlebridge Drive over Bel Pre Creek | 1983 | 315 | Fair |
| Edwards Ferry Road over Broad Run | 1982 | 312 | Fair |
| Tivoli Lake Boulev over Bel Pre Creek | 2017 | 310 | Good |
| Ramp WN to US29 NB over MD 200 Ramp NW | 2011 | 309 | Good |
| Ramp WN to US29 NB over Ramp NB to Briggs Chaney | 2011 | 309 | Good |
| Chandlee Mill Road over James Creek | 1972 | 302 | Fair |
| Crofton Hill Lane over Watts Branch Tributary | 1990 | 300 | Fair |
| Griffith Road over Hawlings River | 1920 | 282 | Fair |
| Upshire Circle over Shady Branch | 1990 | 274 | Good |
| Valley Road over Bulls Run | 1964 | 216 | Good |
| Bonny Brook Lane over Great Seneca Creek Tribu | 2000 | 200 | Good |
| South Palmer Road over Parking Garage | 1980 | 200 | Fair |
| Woodfield School R over Great Seneca Creek | 1974 | 169 | Fair |
| Ranworth Drive over Little Seneca Creek Trib | 1994 | 162 | Good |
| Harris Road West over Little Monocacy River | 1925 | 161 | Fair |
| Kinster Drive over Little Seneca Creek Trib | 2018 | 157 | Good |
| Montevideo Road over Dry Seneca Creek | 1910 | 150 | Good |