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Every bridge in Clay County, South Dakota

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

93 inventoried bridges, busiest first

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

Clay County, South Dakota, has 93 bridges in the 2025 National Bridge Inventory: 38 rated good, 41 fair, and 14 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
SD050 over Sd 50 Wl So Dak Owned R	1981	5,147	Good
SD050 over Vermillion Rv	1981	5,147	Fair
SD046 over Blind Ck	2020	3,303	Good
SD050 E over SD050 L	1977	3,094	Fair
SD019 over BNSF RR	1997	2,764	Good
SD019 over Vermillion Rv	1997	2,764	Good
SD046 over East Fork Frog Ck	1983	2,559	Fair
SD046 over West Fork Frog Ck	2021	2,559	Good
SD046 over Vermillion Rv	2020	2,537	Good
SD019 over Missouri River/county Rd	2001	1,609	Fair
SD019 over Vermillion Rv	1977	1,586	Fair
SD019 over Vermillion Rv	2004	916	Good
SD019 over Vermillion Rv	2004	916	Good
SD019 over Vermillion Rv	2004	916	Good
SD019 over Vermillion Rv	2004	916	Good
SD019 over Vermillion Rv Overflow	2004	916	Good
SD019 over Vermillion Rv Overflow	2004	916	Good
2500 West Main St. over BNSF RR	1996	700	Fair
31530 Universityrd over Vermillion Rv	1968	550	Good
700 S. Dakota Ave. over Vermillion Rv	1975	550	Poor
31160 Univer. Road over Vermillion Rv	1973	297	Fair
29810 Univ. Rd over Ash Ck	2017	285	Fair
46010 302 St. over Vermillion Rv	1998	234	Fair
302ND St. over Frog Ck	1980	232	Fair
30880 Univer. Road over Baptist Ck	1995	220	Fair
46530 Marshaltown over Baptist Ck	1995	206	Fair
46230 306 St. over Vermillion Rv Overflow	1970	150	Poor
46310 313 St over Ck	1998	150	Fair
46320 306 St. over Vermillion Rv	1970	150	Fair
45530 306 Street over Ck	1971	147	Poor
302 St. over Ck	1947	145	Good
46080 313 St. over Clay Ck	1983	125	Poor
30940 Bluff Road over Ck	2019	121	Good
30440 452 Ave over Ck	2016	115	Good
30880 Bluff Road over Ck	1975	111	Fair
46290 300 St. over Vermillion Rv	1982	102	Fair
29920 464 Ave. over Ash Ck	2001	97	Fair
30210 Norwegian Av over Frog Ck	2020	97	Good
30250 464 Ave over Ck	2005	97	Good
30330 453 Ave over Ck	1930	97	Fair
30350 461 Street over Vermillion Rv Overflow	2002	97	Good
30620 455 Ave over Ck	1974	97	Fair
30730 452 Ave over Clay Ck Ditch	2010	97	Good
45206 Bluff Rd over Ck	2019	97	Good
46080 314 St. over Clay Ck Ditch	1900	97	Poor
46320 314 St. over Ck	1935	97	Fair
46450 309TH St. over Vermillion Rv	1981	97	Fair
46530 312 St. over Vermillion Rv	1985	97	Fair
46530 314TH St. over Vermillion Rv	1930	97	Poor
46540 307TH St. over Baptist Ck	1940	97	Poor
29850 Frogcreek Rd over Frog Ck	1965	95	Fair
45920 299 St. over Frog Ck	2009	95	Good
29910 Frogcreek Rd over Frog Ck	1965	94	Fair
459 Ave Frog Ck Rd over Frog Ck	1965	94	Fair
30990 457 Ave. over Clay Ck Ditch	2018	91	Fair
1232 Dawson Road over Vermillion Rv	2000	80	Fair
31160 462 Ave. over Ck	1999	77	Fair
45860 300TH St over Spring Ck	2004	70	Good
30370 461 Ave over Vermillion Rv	2001	50	Good
45880 298 St. over Frog Ck	2011	50	Good
29840 458 Ave over Flynn Dickerson Ditch	2004	45	Good
46580 313 St. over Vermillion Rv	1910	40	Poor
30660 454 Ave over Clay Ck	1935	35	Fair
31080 459 Ave. over Clay Ck Ditch	1996	35	Good
46120 315 St. over Clay Ck Ditch	1988	35	Fair
46340 304 St. over Vermillion Rv	1996	35	Good
30280 458 Ave over Norwegian Gulch	2006	31	Fair
30260 463 Ave. over Ck	2017	30	Good
45910 300 St. over Frog Ck	1993	30	Fair
Township Road over Ash Ck	1997	30	Good
29760 467TH Ave. over Ash Ck	2022	25	Good
29830 Ash Crk Ave. over Ash Ck	1945	25	Poor
29970 457 Ave. over Spring Ck	1988	25	Good
30020 458 Ave. over Spring Ck	2009	25	Good
30920 458 Ave over Ck	1993	25	Fair
30950 461 Ave over Ck	1930	25	Fair
31500 455 Ave over Yankton Clay Ditch	1938	25	Poor
45750 300 St. over Spring Ck	1999	25	Fair
46030 312 St. over Clay Ck Ditch	1996	25	Good
46150 310 St. over Ck	1978	25	Good
46280 298 St over Blind Ck	2004	25	Good
46320 308 St over Vermillion Rv Overflow	1998	25	Fair
46620 298 St. over Ash Ck	2002	25	Fair
46660 303 St. over Baptist Ck	1995	25	Fair
Norwefian Ave. over Norwefian Gulch	1996	25	Fair
30370 458 Ave over Ck	2002	20	Fair
45980 303 St. over Vermillion Rv	1909	15	Poor
46380 308 St over Vermillion Rv	1930	15	Poor
46600 313 St. over Ck	1925	15	Poor
46610 305TH St. over Baptist Ck	1935	15	Poor
46610 304 St. over Baptist Ck	2012	11	Good
45410 307 St over Clay Ck	2005	10	Good
30870 454 Ave over Clay Ck Ditch	1975	5	Fair

Source: FHWA National Bridge Inventory, 2025.

Clay County bridge conditions · South Dakota bridges by county.

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