Bridge conditions in Lawrence County, South Dakota
136 inventoried bridges · 16 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 8 bridges in Lawrence County is rated in poor condition: 16 of 136 on the federal inventory, one of the higher shares in South Dakota.
- 16 of the 136 bridges in Lawrence County, South Dakota, are rated in poor condition (11.8%) in the 2025 National Bridge Inventory, as of .
- 53 bridges (39.0%) are rated good and 67 (49.3%) fair.
- The median Lawrence County bridge was built in 1975.
- The busiest poor-rated bridge is Grant Street over Spearfish Ck (built 1988), carrying about 3,981 vehicles a day.
Good 39.0% · Fair 49.3% · Poor 11.8% of 136 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 |
|---|---|---|---|
| Grant Street over Spearfish Ck | 1988 | 3,981 | Poor |
| County Rd 014B over Miller Ck | 1934 | 2,000 | Poor |
| US014A over Ice Box Ck | 1964 | 1,725 | Poor |
| I-90 Service Road over Crow Ck | 1940 | 1,500 | Poor |
| Camp Comfort Road over Spearfish Ck | 1975 | 500 | Poor |
| Whitewood Service over County Rd Rc P&e RR | 1937 | 500 | Poor |
| Nemo Road over Boxelder Ck | 1974 | 425 | Poor |
| I-90 Service Road over Spring Ck | 1938 | 335 | Poor |
| Nemo Road over Boxelder Ck | 1975 | 300 | Poor |
| Nemo Road over Boxelder Ck | 1975 | 300 | Poor |
| Maitland Road over False Bottom Ck | 1977 | 100 | Poor |
| Christensen Road over False Bottom Ck | 1970 | 100 | Poor |
| Yellow Creek Road over Whitewood Ck | 1979 | 69 | Poor |
| Elmore Rd over Spearfish Ck | 1901 | 50 | Poor |
| St Onge Road over Miller Ck | 1950 | 50 | Poor |
| 900006: Peterson over Whitewood Creek | 2011 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Jackson Blvd over Spearfish Ck | 1966 | 12,135 | Fair |
| US014A Pine St over Whitewood Ck | 1967 | 11,370 | Fair |
| US014A over I090 | 2016 | 10,868 | Good |
| I090 W over Sandstone Dr | 1970 | 10,406 | Fair |
| I090 E over Sandstone Dr | 1970 | 10,406 | Good |
| US014A over Ck | 1994 | 9,638 | Good |
| Jackson Blvd over I090 | 1971 | 9,388 | Good |
| US014A over Ck | 1994 | 9,387 | Good |
| I090 W over False Bottom Ck | 1970 | 8,455 | Good |
| I090 E over False Bottom Ck | 1970 | 8,455 | 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.