Dane County Bridge Report Card

Dane County scores 80 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B80 / 100

Local infrastructure snapshot

Dane County, Wisconsin

Dane County has 593 bridges in the National Bridge Inventory, with 42 rated poor and 11 rated scour-critical. Its poor-condition share of 7.1% is above the 6.7% statewide average. Poor-condition bridges carry about 197,547 daily vehicle crossings.

593Total Bridges

42Poor (7.1%)

273Fair (46.0%)

11Scour-Critical

Quote-Ready Local Facts

7.1%of county bridges are in poor condition, compared with 6.7% statewide and 6.7% nationally.

197,547daily vehicle crossings are on poor-condition bridges in the county.

11bridges are rated scour-critical, or 1.9% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Dane County a Bridge Condition Exposure Score of 80/100 (B). The county has 593 bridges in the National Bridge Inventory, including 42 in poor condition and 11 rated scour-critical. Poor-condition bridges carry about 197,547 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	7.1%	14.2
Poor-condition traffic exposure	25	2.4% of measured traffic	1.8
Scour-critical bridge share	20	1.9%	3.7
Average age vs national baseline	10	37 years vs 48 nationally	0.0
Traffic-data completeness	5	8,371,549 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	7.1%
State Poor-Condition Share	6.7%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.9%
Average Bridge Age	37 years
Poor-Condition Traffic Exposure	197,547 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeCth M / Century Av over Pheasant Branch Creek — 22,500 vehicles/day Oldest Listed BridgeLrd E Dyreson RD over Yahara River — built in 1897 All County BridgesBrowse every bridge record in Dane County.

Top Bridges to Watch in Dane County

Bridge	Reason	Condition	Daily Traffic	Year Built
Cth Bb over Koshkonong Creek	Poor condition + traffic exposure	Poor	1,500	1914
Cth Jj over Vermont Creek	Poor condition + traffic exposure	Poor	314	1958
Lrd Bell Brook RD over Br Story Creek	Poor condition + traffic exposure	Poor	88	1923
Lrd Spring RD over Br Yahara River	Poor condition + traffic exposure	Poor	58	1930
Lrd Lewis RD over W. Branch Of Sugar River	Poor condition + traffic exposure	Poor	50	1930
Cth M / Century Av over Pheasant Branch Creek	Poor condition + traffic exposure	Poor	22,500	1956
Lrd John Nolen DR over Lake Monona	Poor condition + traffic exposure	Poor	21,600	1966
Lrd John Nolen DR over Lake Monona	Poor condition + traffic exposure	Poor	21,600	1968
Lrd John Nolen DR over Lake Monona	Poor condition + traffic exposure	Poor	21,600	1968
Lrd John Nolen DR over Lake Monona	Poor condition + traffic exposure	Poor	21,600	1975

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.