Grant County Bridge Report Card
Grant County scores 55 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Grant County, North Dakota
Grant County has 59 bridges in the National Bridge Inventory, with 6 rated poor and 7 rated scour-critical. Its poor-condition share of 10.2% is at or below the 11.1% statewide average. Poor-condition bridges carry about 100 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Grant County a Bridge Condition Exposure Score of 55/100 (F). The county has 59 bridges in the National Bridge Inventory, including 6 in poor condition and 7 rated scour-critical. Poor-condition bridges carry about 100 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 | 10.2% | 20.3 |
| Poor-condition traffic exposure | 25 | 1.4% of measured traffic | 1.0 |
| Scour-critical bridge share | 20 | 11.9% | 20.0 |
| Average age vs national baseline | 10 | 56 years vs 48 nationally | 3.2 |
| Traffic-data completeness | 5 | 7,356 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 | 10.2% |
| State Poor-Condition Share | 11.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 11.9% |
| Average Bridge Age | 56 years |
| Poor-Condition Traffic Exposure | 100 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Grant County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| 52nd Avenue over Heart River | Poor condition + traffic exposure | Poor | 20 | 1927 |
| 49th ST SW over Peters Creek | Poor condition + traffic exposure | Poor | 20 | 1932 |
| Irrsr County Hiway over Ceder Creek | Poor condition + traffic exposure | Poor | 20 | 1940 |
| 72nd AVE SW over Cannonball River | Poor condition + traffic exposure | Poor | 20 | 1944 |
| 45th Avenue SW over Creek | Poor condition + traffic exposure | Poor | 10 | 1942 |
| 64th ST SW over Antelope Creek | Poor condition + traffic exposure | Poor | 10 | 1967 |
| Irrsr Nd Hiway 49 over Cedar Creek | Scour-critical foundation rating | Fair | 240 | 1972 |
| 74th AVE SW over Antelope Creek | Scour-critical foundation rating | Fair | 80 | 1948 |
| Heil Road over Creek | Scour-critical foundation rating | Fair | 80 | 1963 |
| 58th ST SW over Coal Creek | Scour-critical foundation rating | Fair | 50 | 1965 |
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.