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Every bridge in Charleston County, South Carolina

Name: Every bridge in Charleston County, South Carolina
Creator: Bridge Report Card
License: https://creativecommons.org/publicdomain/zero/1.0/

339 inventoried bridges, busiest first

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Charleston County, South Carolina, has 339 bridges in the 2025 National Bridge Inventory: 141 rated good, 189 fair, and 9 poor (as of August 20, 2026).
This index lists every one of them, busiest first; each links to its own condition record.

Bridge	Built	Vehicles/day	Condition
I-26 over RR NS Spur & Taylor St	1964	170,100	Fair
I-26 over Goose Creek	1960	109,600	Fair
I-26 over RR Csxt	1963	94,100	Poor
US 17 over Cooper River Town Creek	2005	94,100	Good
US 17 over Marsh	2005	94,100	Good
US 17 over RR Csxt & US 52 Bus	2005	94,100	Fair
I-26 EB over S.C.642	1962	93,200	Fair
I-26 over S.c 7/COSGROVE Ave	1964	93,200	Fair
I-26 over S-222/baker Hospital	1964	90,000	Fair
I-26 over S-1110 & RR NS	1966	87,800	Fair
I-26 over S-1600 & RR NS	1964	85,050	Fair
I-26 over Midland Park Rd.-s-1187	1964	84,650	Fair
S-10-75 over I-26	2005	76,900	Good
US 17 over S-1271/bowman Road	2014	74,100	Good
US 52 over Goose Creek	2003	65,500	Fair
Sc 30 over Ashley Riv & Wappoo Crk	1993	61,400	Fair
I-26 EB over S-46/heriot St	1968	60,100	Fair
Ramp on I-26 EB over I-26	2004	54,200	Fair
US 52 Con WB over US 52 EB	1963	54,200	Fair
Sc 171/FOLLY Rd over James Island Creek	2009	50,900	Fair
US 78 EB over S-43/n.a.d Rd	2003	49,300	Good
US 78 over College Park Canal	2001	49,300	Fair
US 78 over I-26	2003	49,300	Good
Sc 7 over Ashley River	1953	47,800	Poor
US 17 NB over US 52/MEETING St	2005	47,050	Good
US 17 SB over I-26 & US 52/MEETING St	2005	47,050	Good
US 78 over Popperdam Creek	2001	46,700	Fair
Sc 171 over Wappoo Creek	1956	45,400	Fair
I-526 EB over Airport Access__l-4486	1986	45,150	Fair
I-526 WB over Airport Access__c-4486	1986	45,150	Fair
S-10-75 over Popperdam Creek	1975	45,100	Good
I-26 EB over S-2472/oceanic St	1967	43,900	Fair
I-526 EB over I-26 & S-1600 & RR	1990	41,550	Good
I-562 WB over I-26	1990	41,550	Fair
I-526 EB over Sc 642	1986	41,500	Fair
I-526 Ebl over S-62 Montague Ave	1986	41,500	Fair
I-526 Ebl over Sclrr	1986	41,500	Good
I-526 Wbl over S-62 Montague Ave	1986	41,500	Fair
I-526 Wbl over Sclrr	1986	41,500	Good
I-526 EB over US 52&s-60&rr Csxt&ns	1992	41,150	Fair
I-526 WB over US 52&s-60&rr Csxt&ns	1992	41,150	Fair
I-526 EB over Ashley River&bull Creek	1980	40,750	Fair
I-526 EB over Sc 461/PAULCANTRELL Blvd	1982	40,750	Fair
I-526 EB over Sc 61	1983	40,750	Fair
I-526 WB over Ashley River&bull Creek	1980	40,750	Fair
I-526 WB over Sc 61	1983	40,750	Fair
I-526 Ebl over S-771 Parmount St	1986	40,050	Fair
I-526 WB over S-771 Parmount St	1986	40,050	Fair
I-526 Wbl over Sc 642	1986	40,050	Fair
Ramp on I-526 EB over St Andrews Canal	1982	38,700	Fair
US 17 NB over Ashley River	1961	38,250	Poor
US 17 NB over Sc 30/s-658	1997	38,250	Fair
US 17 SB over Ashley River	1926	38,250	Fair
US 17 SB over Sc 30/s-658	1997	38,250	Fair
S-10-43/n.a.d Rd over US 52	2003	37,900	Good
Ramp Off US 17 NB over Harry M Hallman Jr Blvd	2005	37,500	Good
Sc 703 over Shem Creek	1947	37,500	Poor
Sc 700/MAYBANK Hwy over Stono River & Pennys Crk	2004	37,300	Fair
I-526 EB over S-97/long Point Road	1990	35,900	Fair
I-526 EB over Tidal Creek	1988	35,900	Fair
I-526 EB over Wando Riv & Local Roads	1989	35,900	Fair
I-526 WB over S-97/long Point Road	1990	35,900	Fair
I-526 WB over Tidal Creek	1988	35,900	Fair
I-526 WB over Wando Riv & Local Roads	1989	35,900	Fair
US 17/SAVANNAH Hwy over Rantowles Creek	2007	35,900	Good
S-10-60 over Filbin Creek	1992	34,700	Fair
US 17 NB over Harry M Hallman Jr Blvd	2005	33,000	Fair
US 17 SB over Harry M Hallman Jr Blvd	2005	33,000	Good
I-526 EB over Hobcaw Creek	1981	30,900	Fair
I-526 EB over L-4436/wakendaw Rd	1981	30,900	Fair
I-526 EB over S-56/mathis Ferry Rd	1981	30,900	Fair
I-526 EB over Trib to Hobcaw Creek	1990	30,900	Fair
I-526 WB over Hobcaw Creek	1990	30,900	Fair
I-526 WB over L-4436/wakendaw Rd	1991	30,900	Fair
I-526 WB over Trib to Hobcaw Creek	1990	30,900	Fair
Ramp on Sc 30 WB over S-30eb/lockwood Dr	1993	30,700	Good
Sc 30 EB over Marsh	1992	30,700	Fair
Sc 30 over Marsh	1992	30,700	Fair
S-10-62 over I-26	1963	30,600	Fair
Ramp Off I-26 EB over US 78/KING Street	1969	30,450	Fair
Ramp on I-26 WB over Ramp Off I-26 EB & US 78	1969	30,450	Fair
Ramp on I-26 EB over Vegetative Right of Way	1989	29,100	Good
S-10-20/main Rd over RR Csxt & L-1376 &s-1377	1980	28,400	Fair
S-10-20/main Rd over Stono River	2004	28,400	Good
Sc 61 NB over US 17&rampsonus17&sc700	1995	26,800	Fair
Sc 61 SB over US 17 & Sc 700	1995	26,800	Good
S-57/bees Ferry Rd over Church Creek	2014	25,800	Good
US 17 NB over RR Csxt	1957	25,250	Fair
US 17 SB over RR Csxt	1949	25,250	Fair
S-10-1028 over James Island Creek	1961	25,000	Fair
Ramp on I-26 WB over I-26	1990	24,800	Fair
US 78 EB over US 52	2003	24,650	Fair
Sc 61 over Marsh	1995	24,100	Good
Sc 642 over RR Csxt	1955	22,500	Fair
S-10-62 over RR NS	1963	22,300	Fair
Sc 461 NB over RR Csxt	1994	22,000	Good
Sc 461 SB over RR Csxt	1994	22,000	Good
L-10-4695 over Filbin Creek	2023	21,100	Good
Ramp Off Sc 30 EB over Vegetative Right of Way	1996	21,000	Fair
Ramp on Sc 30 EB over Vegetative Right of Way	1996	21,000	Fair
Sc 61 over Marsh	1995	21,000	Fair
I-526 WB over US 17	1991	20,750	Fair
I-526WB/RAMPON526 over S-56/mathis Ferry Rd	1990	20,750	Fair
US 17 NB over Ramp 5030 and 5031	1978	20,450	Fair
Sc 7/COSGROVE Ave over S-39 & S-163 & RR Csxt	2016	20,400	Good
Sc 517 over Intracoastal Waterway	1993	20,000	Fair
I-526 EB over S-1168/savage Rd	1982	19,350	Fair
I-526 WB over S-1168/savage Rd	1982	19,350	Fair
I-526 WB over Sc 461/ Paulcantrell Bvd	1982	19,350	Fair
US 52/RIVERS Ave over RR Csxt @ S-10-39	1936	19,300	Fair
Ramp on I-26 WB over S-1600/lacross Rd	1989	19,200	Fair
Ramp on US 17 SB over US 17 NB	2005	18,750	Good
S-10-1342 over I-26	2011	18,200	Good
S-10-97 over Tidal Stream	1972	18,100	Poor
US 17 NB over Wallace River	2008	17,950	Good
US 17 SB over Wallace River	1971	17,950	Fair
S-20/bohicket Rd over Bohicket Creek	2008	17,900	Good
S-20/bohicket Rd over Tidal Stream	2019	17,900	Good
Sc 61 over Church Creek	1936	17,900	Fair
Sc 61 over RR Csxt	1936	17,700	Fair
S-1271/bowman Rd over Shem Creek	2012	17,600	Good
S-10-20/main Rd over Trib to Bohicket Creek	1978	17,200	Fair
US 17 NB over Edisto River Swamp	1925	17,100	Fair
S-10-13/remount Rd over I-26	2010	16,400	Fair
S-57/bees Ferry Rd over Bear Swamp	2006	16,000	Good
Ramp Off US 17 SB over Marsh & RR Csxt	2005	15,700	Fair
Sc 703 over Intracoastal Waterway	1945	15,500	Fair
I-526 EB over US 17	1991	15,350	Good
Sc 171/FOLLY Rd over Folly River	2016	14,800	Good
Sc 171/FOLLY Rd over Long Island River	2016	14,800	Good
Sc 171/FOLLY Rd over Oak Island Creek	1999	14,800	Fair
US 52 W/rivers Ave over Filbin Creek	1965	14,400	Fair
L-1106/palcommpkwy over Mcchune Branch	2011	13,700	Good
L-1106/palcommpkwy over Mccune Branch	2011	13,700	Good
L-1106/palcommpkwy over Mccune Branch	2011	13,700	Good
S-10-894/azalea Dr over I-26 & S-2463/harvey Ave	1963	13,700	Fair
Ramp on I-26 WB over Access Rd & US 52	2005	13,400	Good
L-4486/intrntlblvd over Unnamed Stream	1995	13,200	Good
L-4486/intrntlblvd over Unnamed Stream	1995	13,200	Good
Ramp Off I-526 EB over Vegetative Right of Wa	1992	13,200	Fair
S-10-53 over James Island Creek	1999	13,200	Good
Ramp Off I-26 EB over I-26&RAMPSON US 17&US 52	2005	13,000	Good
L-10-32 over Noisette Creek	2016	12,900	Good
S-10-894/azalea Dr over Brickyard Creek	1961	12,500	Fair
Ramp Off Sc 30 WB over Marsh	1993	12,339	Good
I-526 EB over US 17 & Sc 7	1999	12,100	Fair
Ramp on Sc 30 WB over Marsh	1993	11,922	Fair
Ramp on US 17 NB over US 17 & Access Road	1962	11,908	Fair
Ramp Off I-526 over Fiblin Creek	1993	11,500	Fair
Ramp on I-526 WB over Filbin Creek	1992	11,500	Fair
US 17 NB over Tea Farm Creek	2001	11,200	Good
US 17 SB over Tea Farm Creek	1971	11,200	Fair
Ramp Off I-526 WB over Trib to Hobcaw Creek	1990	10,800	Fair
L-4695/centrepntdr over Unnamed Stream	1998	10,550	Good
L-4695/centrepntdr over Unnamed Stream	1998	10,550	Good
L-4696/kiawislpky over Kiawah River	1987	10,400	Good
S-881/lincoln Ave over Jordan Creek	1965	10,100	Fair
US 78/KING St over RR Csxt & S-39	2015	10,100	Good
S-10-62 over US 52	1963	9,600	Fair
Ramp Off I-526 WB over Filbin Creek	1992	8,900	Fair
Ramp Off I-526 EB over I-526 & S-56	1991	8,600	Fair
Ramp On&off I-526 over US 17	2013	8,600	Good
Sc 162/HIGHWAY 162 over Log Bridge Creek	1921	8,600	Fair
S-10-58 over Filbin Creek	1992	8,300	Fair
Ramp Off I-526 EB over Vegetative Right of Way	1992	8,000	Good
Ramp on I-526 EB over Vegetative Right of Way	1992	8,000	Fair
S-10-54/river Rd over Simmons Creek	1994	7,700	Fair
S-10-894/azalea Dr over Noisette Creek	1971	7,700	Fair
Ramp on I-526 EB over SC7/SAM Rittenberg Blvd	1999	7,300	Good
Ramp on I-526 WB over Filbin Creek & RR Csxt	1992	7,000	Fair
L-10-4681 over St. Andrews Canal	2001	6,900	Fair
S-10-91/river Rd over Tidal Stream	1969	6,900	Fair
L-1106/palmcompkwy over Mcchune Branch	2010	6,850	Good
L-1106/palmcompkwy over Mcchune Branch	2010	6,850	Good
Ramp Off Sc 30 WB over Marsh	1996	6,731	Fair
Ramp Off I-526 EB over RR Csxt	1992	6,700	Fair
Sc 700/MAYBANK Hwy over Church Creek	1974	6,700	Fair
S-10-475 over I-526 Mark Clark Expwy	1980	6,500	Fair
Ramp on I-26 EB over Vegetative Right of Way	1989	6,400	Good
Ramp on US 17 NB over US 52 Bus/morrison Dr	2005	6,400	Good
Ramp on US 17 NB over Johnson St & RR Csxt	2005	6,300	Good
Sc 165/HIGHWAY 165 over Caw Caw Swamp -no 1	2019	6,300	Good
Sc 165/HIGHWAY 165 over Caw Caw Swamp-no 3	2019	6,300	Good
Sc 165/highway165 over Caw Caw Swamp-no.2	2019	6,300	Good
Ramp Off I-26 EB over Filbin Creek	1989	6,100	Good
S-10-91river Rd over Tidal Creek	1967	6,100	Fair
Sc 703/PALM Blvd over Breach Inlet	2002	5,900	Fair
US 17 NB over Awendaw Creek	1977	5,900	Fair
US 17 SB over Awendaw Creek	1970	5,900	Fair
Ramp on US 17 SB over Vegetative Right of Way	2005	5,800	Good
S-11 over Marsh	2021	5,600	Good
Ramp on I-26 WB over Montford Ave	1968	5,500	Fair
Ramp on I-26 WB over Ramp to Romney Street	2005	5,500	Good
I-526 Ramp over Ramp on I-526 EB	1981	5,400	Fair
S-10-1442 over Simmons Creek	1967	5,400	Fair
S-10-1442 over Unnamed Stream	1967	5,400	Good
Sc 174 over Dawhoo River	1994	5,400	Fair
Sc 174 over Sand Creek	2020	5,400	Good
Sc 174 over Toogoodoo Creek	1991	5,400	Fair
Sc 174/HIGHWAY 174 over Russell Creek	2020	5,400	Good
Sc 174/HIGHWAY 174 over Store Creek	2018	5,400	Fair
S-10-790 over RR NS	1958	5,100	Fair
S-102/attaway St over Filbin Creek	1963	4,700	Fair
Ramp Off I-26 EB over Montford Ave	1968	4,600	Fair
Ramp Off US 17 SB over US 52 Bus/morrison Dr	2005	4,400	Good
S-10-26/wappoo Rd over Br of Wappoo Creek	1997	4,400	Fair
Ramp on Sc 30 WB over Vegetative Right of Way	1993	4,200	Fair
Ramp on I-526 EB over Vegetative Right of Way	1989	4,000	Good
Ramp on I-526 WB over Vegetative Right of Way	1990	4,000	Good
Sc 165 over Mellichamp Branch	1988	4,000	Fair
Ramp Off I-526 WB over Filbin Creek	1992	3,800	Fair
Ramp on I-26 WB over Mall Rd Access	1980	3,650	Fair
Ramp Off Sc 30 EB over Marsh	1993	3,500	Good
Ramp on I-526 EB over Vegetative Right of Way	1992	3,400	Good
S-10-195/eagle Dr over I-26	1963	3,300	Fair
S-10-91/river Rd over Unnamed Stream	1963	3,300	Fair
S-10-317 over Unnamed Stream	1975	3,100	Fair
Ramp Off I-56 WB over RR Csxt	1986	3,000	Good
Ramp Off I-26 WB over Vegetative Right of Way	2005	2,800	Fair
S-10-54/chisolm Rd over Trib to Stono River	2006	2,800	Good
US 52 Ramp over Con to I-26 WB	2020	2,800	Good
I-26 Ramp over EB to S-32 (spruill Ave	2020	2,500	Good
Ramp on I-26 WB over RR Csxt&rr NS&US78	2020	2,500	Good
S-60/rhett Ave over Noisette Creek	1952	2,400	Fair
Ramp Off I-26 EB over Irr Csxt&rr&i-26&us 78	2020	2,300	Good
Ramp on Sc 30 WB over Marsh	1996	2,139	Fair
Ramp on I-26 over Vegetative Right of Way	1968	2,100	Fair
S-10-1156 over Playground Rd Creek	1969	2,100	Fair
S-10-1321 over Local Stream	1966	2,000	Fair
R-5447 Pro over Vegetative Right of Way	2020	1,850	Good
R-5448 Pro over Vegetative Right of Way	2020	1,850	Good
Ramp on I-26 EB over I-26&US 78 & RR Csxt	2020	1,750	Good
S-1032/steed CR Rd over Steed Creek	2009	1,750	Good
S-1032/steed CR Rd over Stream	2009	1,750	Good
S-390/toogoodoo Rd over Swinton Creek	1975	1,750	Poor
S-390/toogoodoo Rd over Toogoodoo Creek	1977	1,750	Fair
S-10-379/ohear Ave over Br of Noisette Creek	1962	1,600	Fair
S-379/ohear Ave over Noisette Creek	2015	1,600	Good
Ramp Off I-26 WB over US 78 & RR Csxt	2020	1,450	Good
S-1632/old Pond Rd over Simons Creek	1969	1,450	Poor
S-10-1110 over Unnamed Stream	1973	1,350	Fair
Sc 165 over Tidal Creek	2019	1,350	Good
S-10-1310 over Middle Branch	1964	1,200	Good
S-10-1440 over Br of Simons Crk	1967	1,150	Fair
S-10-2364 over Snee Farm Lake	1997	1,050	Good
S-10-967 over Abbapoola Creek	2014	1,000	Good
S-10-5 over RR Csxt & Bainbridge Con	2020	925	Good
S-10-5 over RR Csxt & Bainbridge Con	2020	925	Good
S-10-92 over Mellichamp Branch	1965	900	Fair
S-1378 over RR Csxt & RR Pr	2021	850	Good
C-10-1001/hut Rd over Hut Creek	2001	800	Good
L-10-1001/abram Rd over Hut Creek	2001	800	Good
L-10-968 over Trib to Steamboat Creek	2005	800	Good
L-9213/plmrsbrdgrd over Mechaw Creek	1986	800	Good
S-10-1845 over Unnamed Stream	1973	800	Fair
S-10-40 over RR Csxt	1927	750	Poor
S-1600/lacross Rd over Unnamed Stream	1992	750	Good
S-10-2363 over Snee Farm Lake	1997	700	Good
S-857/santee Rd over North Collins Creek	1958	700	Fair
S-10-38 over Adams Run	1999	650	Good
S-10-38 over Bear Branch	1965	650	Fair
S-10-38 over Bull Bridge Creek	1964	650	Fair
S-10-38 over Penny Creek	1960	650	Fair
L-/waterfrntdr over Canal	1988	600	Fair
L-1214/ponsbury Rd over Canal	1999	600	Good
L-1214/ponsbury Rd over Canal	1999	600	Good
L-1255/noisettblvd over Noisette Creek	1938	600	Fair
L-1558/rialto Rd over Canal	1999	600	Good
L-2564/tidewaterrd over Shipyard Creek	2021	600	Good
L-2602/parkerslndg over Tidal Creek	1999	600	Fair
L-2771/heriot St over Tidal Creek	2009	600	Good
L-2847/hrbrwatchwy over Tidal Marsh	1990	600	Fair
L-2847/hrbrwatchwy over Tidal Marsh	1990	600	Good
L-3028/hrbrwatchct over Tidal Creek	1990	600	Fair
L-3211/eshirleydr over Trib of Ashley River	1986	600	Good
L-3394/welandcrsg over Filbin Creek	2005	600	Good
L-3394wetlandcrsg over Filbin Creek	2005	600	Good
L-3826/inglesdblvd over Mcchune Branch	2015	600	Good
L-3826/inglesdblvd over Mcchune Branch	2015	600	Good
L-3826/inglesdblvd over Unnamed Stream	2015	600	Good
L-5355/rvrtwneccdr over Tidal Creek	1999	600	Good
L-5416/greymarshrd over Tidal Creek	2000	600	Good
L-5556greymarshrd over Tidal Creek	1999	600	Fair
L-6271/hiddenlksdr over Canal	1988	600	Fair
L-6271/hiddenlksdr over Canal	1988	600	Good
L-6389royaltracln over Tidal Creek	1989	600	Good
L-6427/waterfrntdr over Canal	1988	600	Good
L-6794/weber Blvd over Mcchune Branch	2015	600	Good
L-6794/weber Blvd over RR NS	2015	600	Good
L-7979/nrthwdsblvd over Trib to Goose Creek Res	1986	600	Good
L-8365/queensgtway over Tidal Creek	2000	600	Good
L-8651/oldesaltrun over Tidal Creek	1999	600	Good
S-10-54/chisolm Rd over Burdens Creek	2004	600	Good
S-10-54/chisolm Rd over Tidal Creek	1960	600	Fair
S-857/rutledge Rd over Cedar Creek	1969	600	Fair
S-857/rutledge Rd over Montgomery Creek	1960	600	Fair
S-10-1332 over Unnamed Stream	1967	500	Fair
S-10-2147 over Hut Creek	1996	475	Fair
Sc 45 over Mechaw Creek	1978	450	Good
Sc 45 over Wambaw Creek	2005	450	Good
S-10-2148 over Hut Creek	1996	400	Good
S-10-2418 over Unnamed Strteam	1993	375	Fair
S-10-2521 over Filbin Creek	1986	375	Fair
S-10-98 over Guerin Creek	2003	350	Good
S-10-98 over Guerin Creek	1974	350	Poor
S-10-98 over Wando River	2011	350	Good
S-10-433 over Stream	1998	300	Fair
S-10-1846 over Oyster House Creek	2006	275	Good
S-10-68 over Tidal Stream	1958	275	Fair
S-1624/storen St over Unnamed Stream	1971	275	Fair
S-633/abbapoola Rd over Unnamed Stream	1962	275	Fair
L-10-1004 over Airport Canal	1996	250	Good
L-10-9099 over Tri to Hobcaw Creek	2000	250	Good
S-10-1846 over Tidal Stream	1973	250	Fair
S-10-432/doar Rd over Alligator Branch	1974	250	Good
C-10-4438 over Tidal Creek	2020	225	Good
L-10-1957 over Pennys Creek	2002	225	Good
L-10-3976 over Red Top Canal	1999	225	Fair
L-2123/national Dr over Tidal Creek	1988	225	Good
L-2225/oldjcksnbro over Penny Creek	2007	225	Good
L-2414/kit Hall Rd over Unnamed Stream	1998	225	Good
L-3416/rutgers Rd over College Park Canal	1998	225	Fair
L-3852/cassequeprv over Pond	1989	225	Good
L-635/hyde Park Rd over Caw Caw Swamp	1996	225	Fair
L-635/hyde Park Rd over Drayton Swamp	1996	225	Fair
S-10-1448 over Adams Run Creek	1967	150	Fair
S-1160/chapel Rd over Swinton Creek	1962	150	Fair
S-10-2535 over Pennys Creek	2004	125	Fair
S-10-317 over Drayton Swamp	1955	125	Fair
S-1336/randall Rd over Unnamed Stream	1966	125	Fair
L-3517/s Park Cir over Tidal Creek	1986	113	Fair
L-3517/s Park Cir over Tidal Creek	1986	113	Fair
Johnson St over Vardell Creek	1976	75	Fair
Br. of Cooter Cree over Branch	1988	50	Fair
Fuel Depot Service over Fuel Pipes	2019	50	Good
IRON SWAMP-Bridge over Creek	1979	50	Fair
MILLS BRANCH-Bridg over Branch	1972	50	Fair
WYTHEWOOD CANAL-Br over Canal	1979	50	Fair
S-10-1958 over Trib to Pennys Creek	2010	25	Good

Source: FHWA National Bridge Inventory, 2025.

Charleston County bridge conditions · South Carolina bridges by county.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.