Tripp County Bridge Report Card
Tripp County scores 50 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Tripp County, South Dakota
Tripp County has 89 bridges in the National Bridge Inventory, with 22 rated poor and 3 rated scour-critical. Its poor-condition share of 24.7% is above the 16.1% statewide average. Poor-condition bridges carry about 1,415 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Tripp County a Bridge Condition Exposure Score of 50/100 (F). The county has 89 bridges in the National Bridge Inventory, including 22 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 1,415 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 24.7% | 40.0 |
| Poor-condition traffic exposure | 25 | 4.6% of measured traffic | 3.5 |
| Scour-critical bridge share | 20 | 3.4% | 6.7 |
| Average age vs national baseline | 10 | 48 years vs 48 nationally | 0.1 |
| Traffic-data completeness | 5 | 30,746 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 24.7% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.4% |
| Average Bridge Age | 48 years |
| Poor-Condition Traffic Exposure | 1,415 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Tripp County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Sd049 over Ck | Poor condition + traffic exposure | Poor | 502 | 1972 |
| 277 Street over Old Lodge Ck | Poor condition + traffic exposure | Poor | 100 | 1950 |
| 277 Street over Dog Ear Ck | Poor condition + traffic exposure | Poor | 55 | 1930 |
| 287 Street over Ck | Poor condition + traffic exposure | Poor | 55 | 1935 |
| 279 Street over West Br Bull Ck | Poor condition + traffic exposure | Poor | 55 | 1955 |
| 300 Street over Sand Ck | Poor condition + traffic exposure | Poor | 55 | 1967 |
| 277 Street over Dog Ear Ck | Poor condition + traffic exposure | Poor | 50 | 1940 |
| 271 Street over Cottonwood Ck | Poor condition + traffic exposure | Poor | 50 | 1945 |
| 266 ST Ideal Road over Owl Ck | Poor condition + traffic exposure | Poor | 50 | 1955 |
| 266 ST Ideal RD over Dog Ear Ck | Poor condition + traffic exposure | Poor | 50 | 1955 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.