Clinton County Bridge Report Card

Clinton County scores 93 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A93 / 100

Local infrastructure snapshot

Clinton County, Iowa

Clinton County has 375 bridges in the National Bridge Inventory, with 12 rated poor and 0 rated scour-critical. Its poor-condition share of 3.2% is at or below the 18.6% statewide average. Poor-condition bridges carry about 5,494 daily vehicle crossings.

375Total Bridges

12Poor (3.2%)

102Fair (27.2%)

0Scour-Critical

Quote-Ready Local Facts

3.2%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

5,494daily vehicle crossings are on poor-condition bridges in the county.

0bridges are rated scour-critical, or 0.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Clinton County a Bridge Condition Exposure Score of 93/100 (A). The county has 375 bridges in the National Bridge Inventory, including 12 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 5,494 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	3.2%	6.4
Poor-condition traffic exposure	25	1.2% of measured traffic	0.9
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	465,386 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	3.2%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	37 years
Poor-Condition Traffic Exposure	5,494 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeHarts Mill RD over Mill Creek — 1,410 vehicles/day Oldest Listed Bridge100th St. over Union Creek — built in 1900 All County BridgesBrowse every bridge record in Clinton County.

Top Bridges to Watch in Clinton County

Bridge	Reason	Condition	Daily Traffic	Year Built
Harts Mill RD over Mill Creek	Poor condition + traffic exposure	Poor	1,410	1970
Elvira RD over Mill Creek	Poor condition + traffic exposure	Poor	1,360	1962
290th AVE over Ames Creek	Poor condition + traffic exposure	Poor	1,220	1971
Second AVE RD over Little Mill Creek	Poor condition + traffic exposure	Poor	450	1935
44th AVE over Rock Creek	Poor condition + traffic exposure	Poor	370	1985
432nd Avenue over Elk River	Poor condition + traffic exposure	Poor	310	1968
235th Street over Wapsipinicon River	Poor condition + traffic exposure	Poor	100	1930
235th Street over Branch Of Wapsipinicon	Poor condition + traffic exposure	Poor	100	1930
100th St. over Union Creek	Poor condition + traffic exposure	Poor	78	1900
308th Ave. over Sugar Creek	Poor condition + traffic exposure	Poor	70	1985

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.