Bridge conditions in Davison County, South Dakota
123 inventoried bridges · 22 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Davison County has 22 bridges rated poor out of 123 inventoried, a 17.9% share that puts it well above the national rate of about 7%.
- 22 of the 123 bridges in Davison County, South Dakota, are rated in poor condition (17.9%) in the 2025 National Bridge Inventory, as of .
- 41 bridges (33.3%) are rated good and 60 (48.8%) fair.
- The median Davison County bridge was built in 1970.
- The busiest poor-rated bridge is SD037 over Ck (built 1946), carrying about 3,776 vehicles a day.
Good 33.3% · Fair 48.8% · Poor 17.9% of 123 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD037 over Ck | 1946 | 3,776 | Poor |
| 403RD Avenue over Firesteel Ck | 1910 | 390 | Poor |
| Harmon Drive over Mitchell Lk | 2000 | 350 | Poor |
| 408TH Avenue over South Fork Twelve Mile C | 1930 | 81 | Poor |
| 399TH Avenue over North Br Twelve Mile Ck | 1972 | 71 | Poor |
| 396TH Avenue over Enemy Ck | 1967 | 64 | Poor |
| 257TH St. over Enemy Ck | 1920 | 64 | Poor |
| 398TH Avenue over Enemy Ck | 1915 | 64 | Poor |
| 399TH Avenue over Enemy Ck | 1935 | 64 | Poor |
| 403RD Avenue over Dry Run Ck | 1945 | 64 | Poor |
| 259TH Street over Enemy Ck | 1970 | 64 | Poor |
| 407TH Avenue over North Br Twelve Mile Ck | 1930 | 64 | Poor |
| 407TH Avenue over North Br Twelve Mile Ck | 1930 | 64 | Poor |
| 409TH Ave over North Br Twelve Mile Ck | 1945 | 64 | Poor |
| 401ST Avenue over North Br Twelve Mile Ck | 1925 | 53 | Poor |
| 407TH Avenue over Dry Run Ck | 1935 | 47 | Poor |
| 411TH Avenue over Ck | 1935 | 40 | Poor |
| 402ND Avenue over Dry Run Ck | 1960 | 35 | Poor |
| 260TH Street over Enemy Ck | 1917 | 25 | Poor |
| 408TH Avenue over Dry Run Ck | 1935 | 25 | Poor |
| 400TH Avenue over Ck | 1945 | 20 | Poor |
| 404TH Avenue over Enemy Ck | 1935 | 15 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sanborn St (SD37) over BNSF RR | 2001 | 13,545 | Fair |
| Sanborn St (SD37) over Dry Run Ck | 2001 | 13,545 | Good |
| South Burr Street over Dry Run Ck | 1990 | 11,950 | Good |
| SD037 over I090 | 1966 | 10,351 | Fair |
| SD037 over Dry Run Ck | 1996 | 9,756 | Good |
| SD037 over 4TH Ave BNSF RR | 1997 | 7,642 | Good |
| I090 W over SD037S | 1966 | 7,206 | Fair |
| I090 E over SD037S | 1966 | 7,206 | Fair |
| I090 W over BNSF RR | 1967 | 7,206 | Fair |
| I090 E over BNSF RR | 1967 | 7,206 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of South Dakota: South Dakota bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.