Rock County Bridge Report Card
Rock County scores 83 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Rock County, Wisconsin
Rock County has 304 bridges in the National Bridge Inventory, with 13 rated poor and 11 rated scour-critical. Its poor-condition share of 4.3% is at or below the 6.7% statewide average. Poor-condition bridges carry about 24,920 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Rock County a Bridge Condition Exposure Score of 83/100 (B). The county has 304 bridges in the National Bridge Inventory, including 13 in poor condition and 11 rated scour-critical. Poor-condition bridges carry about 24,920 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 | 4.3% | 8.6 |
| Poor-condition traffic exposure | 25 | 1.0% of measured traffic | 0.8 |
| Scour-critical bridge share | 20 | 3.6% | 7.2 |
| Average age vs national baseline | 10 | 32 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 2,394,342 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 | 4.3% |
| State Poor-Condition Share | 6.7% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.6% |
| Average Bridge Age | 32 years |
| Poor-Condition Traffic Exposure | 24,920 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Rock County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Cth N over Otter Creek | Poor condition + traffic exposure | Poor | 1,461 | 1964 |
| Lrd Lathers RD over Turtle Creek | Poor condition + traffic exposure | Poor | 474 | 1887 |
| Lrd Milton Shopier over Br Blackhawk Creek | Poor condition + traffic exposure | Poor | 165 | 1923 |
| Lrd Cleophas RD over Raccoon Creek | Poor condition + traffic exposure | Poor | 82 | 1918 |
| Ush 51-center AVE over Union Pacific Rr | Poor condition + traffic exposure | Poor | 14,600 | 1982 |
| Sth 213-4th ST over Rock River | Poor condition + traffic exposure | Poor | 5,700 | 1962 |
| Cth J over Turtle Creek Overflow | Poor condition + traffic exposure | Poor | 1,036 | 1953 |
| Lrd Creek RD over Turtle Creek | Poor condition + traffic exposure | Poor | 398 | 1957 |
| Lrd Oriley RD over Turtle Creek | Poor condition + traffic exposure | Poor | 293 | 1963 |
| Cth J over Little Turtle Creek | Poor condition + traffic exposure | Poor | 272 | 1976 |
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.