Roscommon County Bridge Report Card
Roscommon County scores 78 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Roscommon County, Michigan
Roscommon County has 42 bridges in the National Bridge Inventory, with 0 rated poor and 4 rated scour-critical. Its poor-condition share of 0.0% is at or below the 11.0% statewide average.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Roscommon County a Bridge Condition Exposure Score of 78/100 (C). The county has 42 bridges in the National Bridge Inventory, including 0 in poor condition and 4 rated scour-critical. Poor-condition bridges carry about 0 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 | 0.0% | 0.0 |
| Poor-condition traffic exposure | 25 | 0.0% of measured traffic | 0.0 |
| Scour-critical bridge share | 20 | 9.5% | 19.0 |
| Average age vs national baseline | 10 | 55 years vs 48 nationally | 2.7 |
| Traffic-data completeness | 5 | 129,942 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 | 0.0% |
| State Poor-Condition Share | 11.0% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 9.5% |
| Average Bridge Age | 55 years |
| Poor-Condition Traffic Exposure | 0 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Roscommon County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| M-18|m-55|w Hought over Denton Creek | Scour-critical foundation rating | Fair | 11,420 | 1959 |
| Old M-76 over Cedar Creek | Scour-critical foundation rating | Fair | 1,767 | 1949 |
| Old M-76 over Au Sable River | Scour-critical foundation rating | Fair | 1,543 | 1949 |
| Old Us-27 over Wolf Creek | Scour-critical foundation rating | Good | 1,276 | 1935 |
| County RD 100|suns over I-75 SB | High traffic | Fair | 9,280 | 1971 |
| County RD 100|suns over I-75 NB | High traffic | Fair | 9,280 | 1971 |
| M-55 EB Ramp over I-75 NB | High traffic | Fair | 7,828 | 1971 |
| M-55 WB over I-75 NB | High traffic | Fair | 7,828 | 1971 |
| I-75 Sb|m-55 EB over Old 76|s Saint Helen RD | High traffic | Fair | 7,800 | 1971 |
| I-75 Nb|m-55 WB over Old 76|s Saint Helen RD | High traffic | Fair | 7,368 | 1971 |
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.