Clarke County Bridge Report Card

Clarke County scores 55 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F55 / 100

Local infrastructure snapshot

Clarke County, Iowa

Clarke County has 168 bridges in the National Bridge Inventory, with 54 rated poor and 3 rated scour-critical. Its poor-condition share of 32.1% is above the 18.6% statewide average. Poor-condition bridges carry about 2,833 daily vehicle crossings.

168Total Bridges

54Poor (32.1%)

66Fair (39.3%)

3Scour-Critical

Quote-Ready Local Facts

32.1%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

2,833daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 1.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Clarke County a Bridge Condition Exposure Score of 55/100 (F). The county has 168 bridges in the National Bridge Inventory, including 54 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 2,833 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	32.1%	40.0
Poor-condition traffic exposure	25	2.6% of measured traffic	1.9
Scour-critical bridge share	20	1.8%	3.6
Average age vs national baseline	10	48 years vs 48 nationally	0.0
Traffic-data completeness	5	110,494 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	32.1%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.8%
Average Bridge Age	48 years
Poor-Condition Traffic Exposure	2,833 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFM over Walnut Creek — 459 vehicles/day Oldest Listed BridgeSherman ST over Drainage — built in 1900 All County BridgesBrowse every bridge record in Clarke County.

Top Bridges to Watch in Clarke County

Bridge	Reason	Condition	Daily Traffic	Year Built
FM over Branch Otter Creek	Poor condition + traffic exposure	Poor	40	1951
Local over Small Creek	Poor condition + traffic exposure	Poor	15	1972
Local over East Long Creek	Poor condition + traffic exposure	Poor	5	1977
FM over West Creek	Poor condition + traffic exposure	Poor	459	1958
FM over Walnut Creek	Poor condition + traffic exposure	Poor	459	1976
FM over Otter Creek	Poor condition + traffic exposure	Poor	319	1969
FM over South West Creek	Poor condition + traffic exposure	Poor	141	1960
FM over Branch Bee Creek	Poor condition + traffic exposure	Poor	131	1985
Mill ST over Drainage	Poor condition + traffic exposure	Poor	121	1985
FM over South West Creek	Poor condition + traffic exposure	Poor	89	1978

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.