Bridge conditions in Marshall County, South Dakota
38 inventoried bridges · 13 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Marshall County has 13 bridges rated poor out of 38 inventoried, a 34.2% share that puts it well above the national rate of about 7%.
- 13 of the 38 bridges in Marshall County, South Dakota, are rated in poor condition (34.2%) in the 2025 National Bridge Inventory, as of .
- 7 bridges (18.4%) are rated good and 18 (47.4%) fair.
- The median Marshall County bridge was built in 1968.
- The busiest poor-rated bridge is 415TH Avenue over Crow Creek Ditch (built 1974), carrying about 322 vehicles a day.
Good 18.4% · Fair 47.4% · Poor 34.2% of 38 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 |
|---|---|---|---|
| 415TH Avenue over Crow Creek Ditch | 1974 | 322 | Poor |
| 100TH Street over Wild Rice Creek | 1935 | 80 | Poor |
| 425TH Avenue over Crow Creek | 1940 | 51 | Poor |
| 418TH Avenue over Spain & Langford Ditch | 1979 | 50 | Poor |
| 416TH Avenue over Crow Creek Ditch | 1935 | 35 | Poor |
| 113TH Street over Spain Ditch | 1935 | 35 | Poor |
| 113TH Street over Crow Creek | 1935 | 35 | Poor |
| 422ND Avenue over Spain Ditch | 1930 | 35 | Poor |
| 112TH Street over Crow Creek | 1968 | 35 | Poor |
| 427TH Avenue over Wild Rice Creek | 1960 | 35 | Poor |
| 113TH Street over Crow Creek | 1935 | 30 | Poor |
| 118TH Street over Langford Ditch | 1935 | 25 | Poor |
| 122ND Street over Creek | 1930 | 14 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD010 over Crow Ck | 1942 | 1,344 | Fair |
| SD010 over Drainage Ditch | 1948 | 945 | Fair |
| Irr SD010 over Clear Lake Inlet | 1993 | 692 | Good |
| SD027 over Trib Spain Ditch | 1959 | 613 | Fair |
| SD027 over Dry Run Ck | 1980 | 601 | Fair |
| SD027 over Ck | 1980 | 601 | Fair |
| SD027 over Spain Ditch | 1977 | 601 | Fair |
| SD027 over Spain Ditch | 2007 | 601 | Fair |
| SD027 over Ck | 1977 | 601 | Fair |
| SD027 over Crow Ck | 1977 | 590 | Good |
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.