Dallas County Bridge Report Card

Dallas County scores 81 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B81 / 100

Local infrastructure snapshot

Dallas County, Iowa

Dallas County has 206 bridges in the National Bridge Inventory, with 18 rated poor and 0 rated scour-critical. Its poor-condition share of 8.7% is at or below the 18.6% statewide average. Poor-condition bridges carry about 11,670 daily vehicle crossings.

206Total Bridges

18Poor (8.7%)

92Fair (44.7%)

0Scour-Critical

Quote-Ready Local Facts

8.7%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

11,670daily 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 Dallas County a Bridge Condition Exposure Score of 81/100 (B). The county has 206 bridges in the National Bridge Inventory, including 18 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 11,670 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	8.7%	17.5
Poor-condition traffic exposure	25	2.1% of measured traffic	1.6
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	45 years vs 48 nationally	0.0
Traffic-data completeness	5	557,275 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	8.7%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	45 years
Poor-Condition Traffic Exposure	11,670 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFM over Johnson Creek — 2,628 vehicles/day Oldest Listed BridgeLocal over North Raccoon River — built in 1882 All County BridgesBrowse every bridge record in Dallas County.

Top Bridges to Watch in Dallas County

Bridge	Reason	Condition	Daily Traffic	Year Built
FM over Johnson Creek	Poor condition + traffic exposure	Poor	2,628	1933
FM over Sugar Creek	Poor condition + traffic exposure	Poor	2,628	1933
F-60 over Panther Creek	Poor condition + traffic exposure	Poor	1,930	1966
FM over Stream	Poor condition + traffic exposure	Poor	1,544	1970
15th ST over Butler Creek	Poor condition + traffic exposure	Poor	1,027	1907
Thomas ST over Middle Racoon River	Poor condition + traffic exposure	Poor	574	1951
Warford ST over Frog Creek	Poor condition + traffic exposure	Poor	536	1915
Local over Bear Creek	Poor condition + traffic exposure	Poor	180	1949
Local over North Raccoon River	Poor condition + traffic exposure	Poor	153	1882
FM over Over Iais Rr	Poor condition + traffic exposure	Poor	150	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.