Harrison County Bridge Report Card

Harrison County scores 57 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F57 / 100

Local infrastructure snapshot

Harrison County, Iowa

Harrison County has 222 bridges in the National Bridge Inventory, with 41 rated poor and 3 rated scour-critical. Its poor-condition share of 18.5% is at or below the 18.6% statewide average. Poor-condition bridges carry about 2,161 daily vehicle crossings.

222Total Bridges

41Poor (18.5%)

120Fair (54.1%)

3Scour-Critical

Quote-Ready Local Facts

18.5%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

2,161daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 1.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Harrison County a Bridge Condition Exposure Score of 57/100 (F). The county has 222 bridges in the National Bridge Inventory, including 41 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 2,161 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	18.5%	36.9
Poor-condition traffic exposure	25	0.7% of measured traffic	0.5
Scour-critical bridge share	20	1.4%	2.7
Average age vs national baseline	10	55 years vs 48 nationally	2.8
Traffic-data completeness	5	332,227 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	18.5%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.4%
Average Bridge Age	55 years
Poor-Condition Traffic Exposure	2,161 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFM Easton Trail over Allen Creek — 335 vehicles/day Oldest Listed Bridge325th ST over Keg Creek — built in 1900 All County BridgesBrowse every bridge record in Harrison County.

Top Bridges to Watch in Harrison County

Bridge	Reason	Condition	Daily Traffic	Year Built
FM Tabor AVE over Small Stream	Poor condition + traffic exposure	Poor	110	1956
Parker Trail over Small Creek	Poor condition + traffic exposure	Poor	29	1916
FM Easton Trail over Allen Creek	Poor condition + traffic exposure	Poor	335	1969
FM Laredo AVE over Allen Creek	Poor condition + traffic exposure	Poor	139	1942
L23 Laredo AVE over Steer Creek	Poor condition + traffic exposure	Poor	139	1942
8th Street over Boyer River	Poor condition + traffic exposure	Poor	123	1900
FM - 335th ST over Mosquito Creek	Poor condition + traffic exposure	Poor	120	1920
Loc Canal ST over Willow River	Poor condition + traffic exposure	Poor	100	1916
Medford AVE over Willow River	Poor condition + traffic exposure	Poor	89	1900
Loc 128 Trail over Boyer River	Poor condition + traffic exposure	Poor	89	1940

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.