| US 36 Ml over Davidson Ditch | 2015 | 77,000 | Good |
| US 36 Ml over South Boulder Creek | 1951 | 77,000 | Good |
| US 36 Ml over Coal Creek | 2015 | 66,000 | Good |
| US 36 Ml over Canyon Creek | 1951 | 45,000 | Fair |
| SH 157 Ramp over US 36 Ml | 1971 | 44,000 | Fair |
| Table Mesa Drive over US 36 Ml | 1951 | 44,000 | Fair |
| SH 157 Ml over BNSF RR | 1981 | 43,000 | Fair |
| SH 157 Ml over Boulder Creek | 1981 | 43,000 | Fair |
| SH 157 Ml over Pearl Street | 1985 | 43,000 | Fair |
| SH 157 Ml over Skunk Creek | 1978 | 43,000 | Fair |
| SH 157 Ml over Walnut Street | 1981 | 43,000 | Fair |
| SH 157 Ml over North Goose Creek | 1986 | 42,000 | Fair |
| SH 157 Ml over South Goose Creek | 1986 | 42,000 | Fair |
| US 287 Ml over Draw | 1994 | 39,000 | Fair |
| US 287 over Draw | 1993 | 39,000 | Good |
| SH 157 Ml over Bear Canyon Creek | 1978 | 38,000 | Fair |
| South Boulder Rd over Drainage Ditch Ar | 1996 | 37,000 | Fair |
| SH 157 Ml over BNSF RR | 1988 | 34,000 | Fair |
| SH 157 Ml over Boulder Whiterock Ditch | 1987 | 34,000 | Fair |
| SH 157 Ml over SH 119 Ml | 1988 | 34,000 | Fair |
| SH 157 Ml over Wonderland Creek | 1987 | 34,000 | Fair |
| 30th Street over Boulder Creek | 1963 | 33,663 | Fair |
| US 287 Ml over Coal Creek | 1996 | 32,000 | Good |
| Hover Road over Dry Creek No. 1 | 1985 | 29,369 | Fair |
| SH 7 (arapahoe) over Bike/ped Underpass | 2006 | 29,000 | Fair |
| SH 7 Ml over Bear Canyon Creek | 1985 | 29,000 | Fair |
| SH 93 Ml over Ped. Underpass | 2013 | 27,000 | Fair |
| SH 93 Ml over Pedestrian Underpass | 1992 | 27,000 | Fair |
| Hover Road over St. Vrain River | 1960 | 26,762 | Fair |
| EB US 36 Off Ramp over EB Bus Ramp | 2016 | 26,000 | Good |
| SH 119 over Wonderland Crk and Path | 2006 | 26,000 | Fair |
| US 287 Ml over Lower Boulder Ditch | 1997 | 26,000 | Fair |
| Hover Road over Oligarchy Ditch | 1990 | 25,769 | Fair |
| SH 7 Ml over South Boulder Creek | 1938 | 25,000 | Fair |
| Pearl Parkway over Left Hand Ditch | 1981 | 24,744 | Fair |
| SH 119 ML E.Bnd over Left Hand Creek | 2003 | 24,000 | Good |
| SH 119 ML W.Bnd over Lefthand Creek | 2003 | 24,000 | Good |
| SH 119 Ml over Oligarchy Ditch | 2004 | 24,000 | Fair |
| SH170 ML(McCaslin) over US 36 Ml | 1983 | 24,000 | Fair |
| US 287 Ml over Boulder Creek | 1985 | 24,000 | Fair |
| US 287 Ml over Dry Creek | 1990 | 24,000 | Fair |
| US 287 Ml over Left Hand Creek | 1948 | 24,000 | Fair |
| US 287 Ml over St Vrain Creek | 2016 | 24,000 | Good |
| US 287 Ml over Draw | 1990 | 23,000 | Good |
| US 287 Ml over Highland Ditch | 1999 | 23,000 | Fair |
| SH 119 Ml NB over Beasley Ditch | 1958 | 22,000 | Fair |
| SH 119 Ml Sbnd over Beasley Ditch | 1971 | 22,000 | Fair |
| SH 119 Sbnd over Beasley Ditch | 1971 | 22,000 | Fair |
| SH 93 Ml over Boulder Creek | 2004 | 22,000 | Fair |
| US 287 Ml over Dry Creek | 1947 | 22,000 | Fair |
| 30th Street over North Goose Creek | 1994 | 21,233 | Fair |
| Iris Ave over Elmers Two Mile Ditch | 2005 | 21,112 | Good |
| SH 157 Nbnd over Four Mile Canyon Creek | 1988 | 20,500 | Good |
| SH 157 Sbnd over Four Mile Canyon Creek | 1988 | 20,500 | Good |
| 30th Street over Boulder Lefthand Ditch | 2011 | 20,225 | Good |
| SH 93 Ml over Skunk Creek / Ped Path | 2014 | 20,000 | Fair |
| SH 157 Ml Nbnd over South Boulder Road | 1973 | 19,000 | Fair |
| SH 157 Ml Sbnd over S BLDR Rd-TBLE MSA Dr | 1973 | 19,000 | Fair |
| SH 7 Ml over Draw | 1928 | 19,000 | Fair |
| SH 119 Nbnd over Dry Creek | 1959 | 18,500 | Good |
| US 36 Ml Ebnd over Boulder Creek | 1960 | 18,000 | Fair |
| US 36 Ml Wbnd over Boulder Creek | 1952 | 18,000 | Poor |
| McCaslin Blvd over Coal Creek | 1995 | 17,606 | Fair |
| SH 7 Ml over Coal Creek | 1990 | 17,000 | Good |
| SH 93 Ml over Bear Creek Ditch | 1969 | 17,000 | Good |
| SH 93 Ml over South Boulder Creek | 1969 | 17,000 | Fair |
| 3rd Avenue over Oligarchy Ditch | 1969 | 16,797 | Fair |
| 30th Street over Empson Ditch | 1963 | 16,733 | Fair |
| Ebnd US 36 Ml over US 36 Spur/baseline Rd | 1963 | 16,500 | Fair |
| US 287 Ml Sbnd over Rock Creek | 1994 | 16,500 | Good |
| US 287 Nbnd over Rock Creek | 1993 | 16,500 | Good |
| US 36 Wbnd Spur over US 36 Spur/baseline Rd | 1993 | 16,500 | Good |
| SH 93 Ml over Coal Creek | 1965 | 16,000 | Fair |
| US 36 Ml over Four Mile Canyon Creek | 1957 | 16,000 | Fair |
| US 36 Ml over Ped Underpath / Creek | 2015 | 16,000 | Good |
| 96th Street over BNSF RR | 2006 | 15,821 | Good |
| 96th Street over Coal Creek | 2006 | 15,821 | Good |
| Dillon Road over Coal Creek & Ped Tra | 1993 | 15,732 | Fair |
| County Line Road over Spring Gulch #2 | 2021 | 15,509 | Good |
| Valmont Rd (CR 52) over South Boulder Creek | 2006 | 15,236 | Fair |
| SH 7 Ml Ebnd over Boulder Creek | 1966 | 15,000 | Fair |
| SH 7 Ml Wbnd over Boulder Creek | 1938 | 15,000 | Poor |
| US 36 Ml over Highland Canal | 1972 | 15,000 | Fair |
| US 36 Ml over Supply Ditch | 1972 | 15,000 | Fair |
| Baseline Road over Bear Canyon Creek | 1980 | 14,884 | Fair |
| Valmont Rd over Boulder Creek | 1999 | 14,324 | Good |
| 9th Street over Boulder Creek | 1978 | 14,000 | Fair |
| SH 119 Ml Nbnd over Left Hand Creek | 1959 | 14,000 | Fair |
| SH 119 Ml Sbnd over Left Hand Creek | 1975 | 14,000 | Good |
| SH 52 Ml over Boulder Creek | 2011 | 14,000 | Good |
| Airport Road over Lykins Gulch | 2006 | 13,906 | Fair |
| Folsom Street over Boulder Whiterock Ditch | 1970 | 13,574 | Fair |
| Pike Road over Left Hand Creek | 1994 | 13,459 | Fair |
| Airport Road over St. Vrain River | 2006 | 13,131 | Good |
| Airport Road over St. Vrain River Overflow | 2006 | 13,131 | Fair |
| US 36 Ml over Left Hand Creek | 2019 | 13,000 | Good |
| S. Pratt Parkway over St Vrain Creek | 2019 | 12,909 | Good |
| E 9th Avenue over Oligarchy Ditch | 2004 | 12,630 | Fair |
| 47TH Street over SH 157 Ml | 1989 | 12,000 | Fair |
| Nwp EB over US 287 | 2002 | 12,000 | Fair |
| Nwp WB over EB Dillon Road | 2002 | 12,000 | Fair |
| Nwp WB over US 287 | 2002 | 12,000 | Fair |
| SH 119 Ml Ebnd over St Vrain River | 2003 | 12,000 | Good |
| SH 119 Ml Wbnd over St. Vrain River | 2003 | 12,000 | Fair |
| Pratt Parkway over BNRR and 1st Avenue | 1980 | 11,924 | Fair |
| Broadway over Four Mile Creek/Bike Pth | 1994 | 11,874 | Fair |
| Martin Street over Saint Vrain River | 2009 | 11,759 | Fair |
| North 55th Street over Boulder Creek | 1985 | 11,600 | Fair |
| Rock Creek Pkwy. over Rock Creek | 1999 | 11,360 | Fair |
| Airport Road over Dry Creek | 1994 | 11,244 | Fair |
| N. 95th St (CR19) over Left Hand Creek | 2009 | 11,067 | Good |
| SH 42 Ml over Coal Creek | 1967 | 11,000 | Fair |
| Folsom Street over Goose Creek | 1970 | 10,980 | Fair |
| Valmont Road over Elmers Twomile Creek | 2010 | 10,720 | Good |
| 27th Way over Skunk Creek | 2008 | 10,468 | Good |
| Arapahoe Avenue over Boulder Creek | 1988 | 10,452 | Good |
| Lookout Road over Boulder Cr. Supply Ditch | 1996 | 10,395 | Good |
| Lookout Road over Whiterock Ditch | 1996 | 10,395 | Fair |
| Pearl Parkway over S. Goose Creek Drainage | 1986 | 10,375 | Fair |
| Public Road over Coal Creek | 1927 | 10,350 | Fair |
| Airport Road (CR25 over Left Hand Creek | 2003 | 10,085 | Fair |
| 6th Street over Boulder Creek | 1978 | 10,000 | Fair |
| County Road 1 over Big Dry Creek | 1995 | 9,859 | Fair |
| Boston Ave (CR 18) over St. Vrain Creek | 2024 | 9,636 | Good |
| 17th Avenue over Spring Gulch | 2000 | 9,396 | Good |
| S Boulder Road over South Boulder Creek | 1986 | 9,270 | Fair |
| South Boulder Road over Viele Channel (Ditch) | 1975 | 9,270 | Fair |
| 55th Street over Empson Ditch | 1996 | 9,146 | Fair |
| 3rd Ave WB over Gw RR | 1974 | 9,116 | Poor |
| US 36 Ml over North St Vrain Creek | 2007 | 9,000 | Fair |
| US 36 Ml over North St Vrain Creek | 2007 | 9,000 | Good |
| N. 75th St (Cr 25) over Boulder Creek | 1978 | 8,907 | Fair |
| SH 52 Ml over White Rock Boulder Ditch | 1965 | 8,900 | Fair |
| Folsom Street over Boulder Creek | 1965 | 8,407 | Fair |
| Pearl Parkway over North Goose Creek | 1986 | 8,372 | Fair |
| US 36 Ml over St Vrain Creek | 2000 | 8,200 | Good |
| WB US 36 on Ramp over WB Bus Ramp/bike Path | 2016 | 8,180 | Good |
| 88TH St. over US 36 Ml | 2000 | 8,157 | Good |
| 120TH Street over Coal Creek | 1977 | 8,097 | Fair |
| 95 Street (CR 19) over Boulder Creek | 2010 | 7,778 | Good |
| Rock Creek Pkwy over Community Ditch | 2000 | 7,760 | Poor |
| N. 95th St (Cr 19) over Liggett Ditch | 1984 | 7,744 | Good |
| 3rd Ave. EB over Gw RR | 1969 | 7,667 | Fair |
| 17th Street over Boulder Creek | 1985 | 7,658 | Fair |
| Pace Street over Spring Gulch | 2000 | 7,639 | Good |
| Colorado Avenue over Skunk Creek | 1979 | 7,343 | Fair |
| Price/Frontage Rds over Dry Creek | 1984 | 7,332 | Fair |
| Sunset Street over Saint Vrain Creek | 2016 | 7,282 | Good |
| Arapahoe Avenue over Boulder Creek | 1990 | 7,200 | Fair |
| Brockway Drive over Goodhue Ditch | 1962 | 6,900 | Fair |
| County Road 901 over Boulder Creek | 1976 | 6,549 | Fair |
| SH 119 Ml over Boulder Creek | 1953 | 6,400 | Fair |
| SH 119 Ml over Boulder Creek | 1953 | 6,400 | Fair |
| Nwp EB over EB Dillon Road | 2002 | 6,268 | Fair |
| County Road 31 over St. Vrain Creek | 1979 | 6,233 | Fair |
| SH 119 Ml over Middle Boulder Creek | 1933 | 5,800 | Fair |
| N. 61st Street over Boulder Creek | 1986 | 5,789 | Fair |
| CR 1 (Co Line Rd) over Lower Boulder Ditch | 1996 | 5,611 | Fair |
| Cherryvale Road over SH 36 Ml | 2009 | 5,525 | Fair |
| Dry Creek Drive over Dry Creek No. 1 | 1991 | 5,490 | Fair |
| County Road 1 over Coal Creek | 1996 | 5,198 | Fair |
| Niwot Road (CR 34) over Dry Creek | 1985 | 5,021 | Fair |
| Baseline Road (CR over South Boulder Creek | 1980 | 4,986 | Fair |
| Coalton Drive over Rock Creek | 2000 | 4,964 | Fair |
| SH 119 N/ebnd over Four Mile Creek | 1958 | 4,800 | Fair |
| S Pratt Parkway over Left Hand Creek | 2012 | 4,798 | Good |
| 47th Street over South Goose Creek | 1986 | 4,774 | Fair |
| 21st Ave Eastbound over Oligarchy Ditch | 1975 | 4,495 | Fair |
| County Road 33 over Left Hand Creek | 1980 | 4,344 | Fair |
| Moorhead Avenue over Skunk Creek | 1970 | 4,313 | Fair |
| SH 128 Ml over Coal Creek | 1967 | 4,100 | Fair |
| SH 119 Ml over North Beaver Creek | 1948 | 4,000 | Fair |
| Emma St. over US 287 Ml | 1994 | 3,969 | Fair |
| Alpine Street over Oligarchy Ditch | 1975 | 3,757 | Fair |
| Grandview Meadow D over Dry Creek | 2004 | 3,692 | Good |
| Glenwood Drive over Two Mile Creek | 1972 | 3,439 | Fair |
| 120TH Street over Rock Creek | 1986 | 3,390 | Fair |
| N. 119th St (Cr 3) over St. Vrain Creek | 1988 | 3,288 | Good |
| N. 63rd St (CR39) over Leggett Ditch | 2015 | 3,275 | Good |
| SH 119 Ml over North Boulder Creek | 1948 | 3,200 | Fair |
| Cherryvale Road (C over Davidson Ditch | 1973 | 3,123 | Fair |
| Cherryvale Road over Davidson Ditch | 1986 | 3,123 | Fair |
| Nelson Rd (Cr 20) over Boulder Feeder Ditch | 1950 | 2,692 | Fair |
| Kalmia Avenue over Dry Creek | 2017 | 2,621 | Good |
| N 63rd St (CR 39) over Lefthand Creek | 2011 | 2,610 | Good |
| SH 7 Ml over North St Vrain Creek | 1955 | 2,600 | Fair |
| Martin Street over Left Hand Creek | 2016 | 2,572 | Good |
| Co Rd 3 / 119th S over Dry Creek No 2 | 2013 | 2,541 | Good |
| Harvard Street over Oligarchy Ditch | 1998 | 2,509 | Good |
| Flagstaff Rd CR56 over HIllside Slide | 2014 | 2,463 | Good |
| Flagstaff Rd CR56 over Hillside Slide | 1996 | 2,463 | Good |
| Moorhead Avenue over Bear Creek: Bike Path | 1995 | 2,461 | Fair |
| 83rd St (CO Rd 23) over Little Thompson River | 2017 | 2,443 | Good |
| Kenosha Rd (CR 38) over Coal Creek | 1965 | 2,305 | Fair |
| Flatiron Parkwy over Dry Creek | 1985 | 2,240 | Fair |
| Niwot Road (CR 34) over Boulder Feeder Canal | 2010 | 2,084 | Good |
| McConnell Dr. over Saint Vrain Creek Ovrflw | 2018 | 2,031 | Good |
| McConnell Drive over Saint Vrain Creek | 2006 | 2,031 | Fair |
| Iris Avenue over Wonderland Creek | 2020 | 1,988 | Fair |
| N. 95th St (CR10) over Highland Ditch | 1989 | 1,968 | Good |
| Fordham Street over Dry Creek | 1997 | 1,944 | Fair |
| Iris Avenue/34 St over Wonderland Creek | 2017 | 1,937 | Fair |
| Indiana Avenue over Rock Creek | 1999 | 1,916 | Fair |
| Marshall Road over Coal Creek | 2022 | 1,867 | Good |
| Eisenhower Drive over Empson Ditch | 1972 | 1,860 | Fair |
| South Bowen Street over Left Hand Creek | 1965 | 1,835 | Poor |
| SH 7 Ml over North St Vrain Creek | 1973 | 1,800 | Fair |
| Deerwood Drive over Oligarchy Ditch | 2000 | 1,709 | Fair |
| Mohawk Drive over Bear Crk and Bike Path | 1996 | 1,707 | Good |
| CoRd94(LH Cnyn RD) over Lefthand Creek | 2016 | 1,681 | Good |
| County Road 38 over Boulder Creek | 1988 | 1,640 | Fair |
| 104TH Street over Nwp | 2002 | 1,520 | Fair |
| SH 72 Ml over South Boulder Creek | 1979 | 1,500 | Fair |
| Junction Pl over Goose Creek | 2017 | 1,484 | Fair |
| Junction Place over Boulder and Left Hand Di | 2021 | 1,484 | Good |
| County Road 94 over Lefthand Creek | 2019 | 1,441 | Fair |
| No. 30th Street over Four Mile Creek | 1973 | 1,424 | Poor |
| SH 72 Ml over Middle St Vrain Creek | 1959 | 1,400 | Fair |
| Mountain Dr. over Clover Basin Ditch | 2018 | 1,399 | Good |
| E 5th Avenue over Oligarchy Ditch | 1970 | 1,321 | Fair |
| SH 170 Ml over Community Ditch | 1999 | 1,300 | Fair |
| South Sunset St. over Left Hand Creek | 2000 | 1,274 | Good |
| US 36 Fr Rd over Boulder Creek SR | 1952 | 1,264 | Poor |
| Olympia Avenue over Spring Gulch | 2000 | 1,207 | Good |
| 34th Street over Wonderland Creek | 2018 | 1,200 | Good |
| SH 170 Ml over Davidson Ditch | 1952 | 1,200 | Fair |
| Monroe Drive over Empson Ditch | 2020 | 1,175 | Fair |
| Woodland Rd (CR4) over Highland Ditch | 1976 | 1,163 | Fair |
| NWP Ramp over EB Dillon Road | 2002 | 1,100 | Fair |
| SH 72 Ml over South St Vrain Creek | 1959 | 1,100 | Fair |
| CR 62 (Empire Dr) over Coal Creek | 1935 | 1,080 | Fair |
| Lefthand Canyon Dr over Lefthand Creek | 2019 | 1,078 | Good |
| Horizon Avenue over Rock Creek | 2000 | 1,043 | Fair |
| Spring Drive over Davidson Ditch | 1970 | 1,022 | Good |
| Twin Lakes Road over BLDR and Whiterock Ditch | 1975 | 1,018 | Fair |
| St Vrain Road CR16 over Boulder Feeder Ditch | 1955 | 1,009 | Fair |
| Spencer Street over Oligarchy Ditch | 1975 | 995 | Fair |
| Boston Ave over Spring Gulch | 2017 | 978 | Fair |
| Second Avenue over St. Vrain Creek | 2021 | 946 | Good |
| Sterling Drive over Left Hand Ditch | 1975 | 937 | Fair |
| County Road 132 over Boulder Creek | 1935 | 846 | Fair |
| Kingsridge Blvd. over Wonderland Creek | 1988 | 812 | Fair |
| County Road 81 over James Creek | 2019 | 777 | Good |
| County Road 130 over Middle Boulder Creek | 1990 | 742 | Fair |
| Co Rd 39 (65th St) over Lykins Gulch | 2012 | 741 | Good |
| County Road 81 over Lefthand Creek | 2019 | 735 | Good |
| Hygiene Rd (Cr 10) over Boulder Feeder Ditch | 1987 | 692 | Good |
| Juniper Avenue over Elmers Two Mile Ditch | 1965 | 666 | Fair |
| 48th Street over Goose Creek | 1980 | 664 | Good |
| Martin Drive over Bear Crk and Bike Path | 1995 | 662 | Fair |
| Golf Club Drive over Local Drainage | 2005 | 644 | Good |
| 48th CT over S. Goose Creek | 1986 | 641 | Good |
| County Road 84S over South St. Vrain Creek | 1990 | 637 | Fair |
| Winding Trail Dr over Wonderland Creek | 2018 | 632 | Fair |
| Wagonwheel Gap Rd over Fourmile Creek | 2019 | 630 | Good |
| Fairways Drive over Local Drainage | 2005 | 622 | Good |
| Wagonwheel Gap Rd over Four Mile Creek | 2019 | 587 | Good |
| Independence Ave. over Boulder & Whiterock Dtch | 1973 | 574 | Fair |
| Kalmia Avenue over Elmers Two Mile Ditch | 1973 | 551 | Fair |
| Sunset Way over Dry Creek | 1996 | 540 | Fair |
| SB Table Mesa Dr. over Bear Creek | 1980 | 508 | Fair |
| Hygiene Rd (Cr 10) over St. Vrain Creek | 1981 | 502 | Fair |
| 2nd Avenue over Coal Creek | 1992 | 492 | Fair |
| Wagonwheel Gap Rd over Fourmile Creek | 2019 | 460 | Good |
| Dillon Road over Rock Creek | 2019 | 451 | Good |
| 15th Avenue over Oligarchy Ditch | 1989 | 450 | Fair |
| N 115th St over Highland Ditch | 2012 | 435 | Good |
| Oxford Rd (CR 26) over Boulder Feeder Ditch | 1950 | 422 | Fair |
| Wagonwheel Gap Rd over Four Mile Creek | 2019 | 407 | Good |
| SH 170 Ml over South Boulder Creek | 1930 | 388 | Fair |
| Monarch Road over Dry Creek | 2019 | 349 | Good |
| Golf Club Drive over Local Drainage | 2005 | 318 | Good |
| Marshall Rd (CR 51 over South Boulder Creek | 1988 | 318 | Fair |
| County Road 47 over St. Vrain Supply Canal | 1997 | 316 | Fair |
| Gilpin Drive over Bear Canyon Creek | 1997 | 281 | Good |
| Mc Sorley Lane over South Boulder Creek | 1970 | 272 | Fair |
| County Road 80 over North St. Vrain Creek | 1988 | 268 | Fair |
| County Road 1 over New Ish Ditch | 1980 | 260 | Fair |
| Wildwood Road over Bear Canyon Creek | 1970 | 242 | Good |
| Logan Mill Road over Four Mile Creek | 2019 | 238 | Fair |
| Aurora Avenue over Gregory Creek | 1980 | 226 | Good |
| N 41st St (Cr 59) over Left Hand Creek | 1960 | 226 | Fair |
| County Road 124E over North Boulder Creek | 1994 | 214 | Fair |
| Boulder Hills Dr over Boulder Feeder Ditch | 1980 | 209 | Fair |
| 27th Street over Goose Creek | 2001 | 201 | Good |
| Nfsr 112.0 over South St Vrain Creek | 2011 | 200 | Good |
| County Road 80 over North St. Vrain Creek | 1988 | 199 | Fair |
| Fdr 114 over Middle St. Vrain Creek | 1952 | 198 | Good |
| N 49th St (Cr 51) over Left Hand Creek | 1993 | 191 | Good |
| N 81st St (CR 31) over Left Hand Creek | 1992 | 182 | Good |
| Main Street over James Creek | 2018 | 180 | Good |
| Prospect Road CR24 over Boulder Feeder Ditch | 1988 | 180 | Fair |
| County Road 71 over North St. Vrain Creek | 1991 | 178 | Fair |
| County Road 103 over Middle St. Vrain Creek | 1993 | 170 | Fair |
| CR124E-Hummer Dr. over North Boulder Creek | 1994 | 135 | Fair |
| C. R. 41 (63rd St) over St. Vrain Creek | 1991 | 134 | Fair |
| Bow Mountain Rd. over Fourmile Creek | 2019 | 124 | Good |
| County Road 84W over North St. Vrain Creek | 1927 | 122 | Fair |
| County Road 26 over Left Hand Creek | 1991 | 121 | Good |
| Anderson Hill St over James Creek | 2016 | 117 | Good |
| County Road 103 over Middle St. Vrain Creek | 1993 | 112 | Good |
| Sixth St (CR 130) over Middle Boulder Creek | 2005 | 106 | Fair |
| Niwot Meadow Farm over Dry Creek No 2 | 2005 | 102 | Fair |
| Strath Street over Left Hand Creek | 1970 | 92 | Fair |
| Fdr 114 over Middle St. Vrain Creek | 1952 | 90 | Good |
| County Road 128E over North Boulder Creek | 1994 | 80 | Fair |
| Rogers Road over Lykin Gulch | 2000 | 80 | Fair |
| County Road 35 over St. Vrain Creek | 1996 | 78 | Fair |
| Wild Basin Road over North St. Vrain Creek | 1982 | 75 | Fair |
| Wild Basin Road over North St. Vrain Creek | 1982 | 75 | Fair |
| County Road 116 over Boulder Creek | 1995 | 74 | Fair |
| Co Rd 54A over Middle Boulder Creek | 1917 | 70 | Fair |
| County Road 84S over South St. Vrain Creek | 2019 | 67 | Fair |
| Co Rd 54A over Middle Boulder Creek | 1917 | 66 | Fair |
| County Road 96 over South St. Vrain Creek | 2000 | 64 | Fair |
| County Road 9 over Boulder Creek | 1960 | 59 | Fair |
| County Road 103 over Middle St. Vrain Creek | 1927 | 56 | Fair |
| Fdr 112 over South St Vrain Creek | 1989 | 50 | Fair |
| Fdr 298 & Bc 116 over North Boulder Creek | 1970 | 40 | Fair |
| Boulder Creek Path over Boulder Creek | 2020 | 11 | Fair |
| Spring Creek Place over Wonderland Creek | 2017 | – | Good |