Jefferson County Bridge Report Card
Jefferson County scores 90 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Jefferson County, Wisconsin
Jefferson County has 182 bridges in the National Bridge Inventory, with 9 rated poor and 0 rated scour-critical. Its poor-condition share of 4.9% is at or below the 6.7% statewide average. Poor-condition bridges carry about 4,839 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Jefferson County a Bridge Condition Exposure Score of 90/100 (A). The county has 182 bridges in the National Bridge Inventory, including 9 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 4,839 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 | 4.9% | 9.9 |
| Poor-condition traffic exposure | 25 | 0.4% of measured traffic | 0.3 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 37 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 1,107,631 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 | 4.9% |
| State Poor-Condition Share | 6.7% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 37 years |
| Poor-Condition Traffic Exposure | 4,839 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Jefferson County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Cth N over Deer Creek | Poor condition + traffic exposure | Poor | 2,537 | 1960 |
| Cth D over Bark River | Poor condition + traffic exposure | Poor | 1,500 | 1950 |
| Lrd Rock River RD over Rock River | Poor condition + traffic exposure | Poor | 185 | 1985 |
| Lrd Morgans RD over Oconomowoc River | Poor condition + traffic exposure | Poor | 176 | 1951 |
| Lrd Wright RD over Johnson Creek | Poor condition + traffic exposure | Poor | 155 | 1963 |
| Lrd Rockdale RD over Koshkonong Creek | Poor condition + traffic exposure | Poor | 88 | 1930 |
| Lrd Turner RD over Bark River | Poor condition + traffic exposure | Poor | 82 | 1982 |
| Lrd Staude RD over Duck Creek | Poor condition + traffic exposure | Poor | 58 | 1920 |
| Lrd Hagedorn RD over Duck Creek | Poor condition + traffic exposure | Poor | 58 | 1940 |
| IH 94 WB over Lrd Newville RD | High traffic | Good | 43,300 | 2024 |
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.