Black Hawk County Bridge Report Card

Black Hawk County scores 86 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B86 / 100

Local infrastructure snapshot

Black Hawk County, Iowa

Black Hawk County has 489 bridges in the National Bridge Inventory, with 25 rated poor and 7 rated scour-critical. Its poor-condition share of 5.1% is at or below the 18.6% statewide average. Poor-condition bridges carry about 19,145 daily vehicle crossings.

489Total Bridges

25Poor (5.1%)

210Fair (42.9%)

7Scour-Critical

Quote-Ready Local Facts

5.1%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

19,145daily vehicle crossings are on poor-condition bridges in the county.

7bridges are rated scour-critical, or 1.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Black Hawk County a Bridge Condition Exposure Score of 86/100 (B). The county has 489 bridges in the National Bridge Inventory, including 25 in poor condition and 7 rated scour-critical. Poor-condition bridges carry about 19,145 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	5.1%	10.2
Poor-condition traffic exposure	25	1.2% of measured traffic	0.9
Scour-critical bridge share	20	1.4%	2.9
Average age vs national baseline	10	41 years vs 48 nationally	0.0
Traffic-data completeness	5	1,562,476 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	5.1%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.4%
Average Bridge Age	41 years
Poor-Condition Traffic Exposure	19,145 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeE Ridgeway AVE over Dry Run Creek — 8,392 vehicles/day Oldest Listed BridgeW Ridgeway AVE over S Br Dry Run — built in 1900 All County BridgesBrowse every bridge record in Black Hawk County.

Top Bridges to Watch in Black Hawk County

Bridge	Reason	Condition	Daily Traffic	Year Built
Marquis RD over Shell Rock Riv Overflow	Poor condition + traffic exposure	Poor	207	1992
Osage RD over Poyner Creek	Poor condition + traffic exposure	Poor	59	1960
E Ridgeway AVE over Dry Run Creek	Poor condition + traffic exposure	Poor	8,392	1950
So Main ST RD over S Dry Run	Poor condition + traffic exposure	Poor	6,093	1968
Dubuque RD over Trib To Indian Creek	Poor condition + traffic exposure	Poor	1,532	1957
W Ridgeway AVE over S Br Dry Run	Poor condition + traffic exposure	Poor	1,049	1900
Hammond AVE over Sink Creek	Poor condition + traffic exposure	Poor	373	1900
E Eagle RD over Miller Creek	Poor condition + traffic exposure	Poor	255	1965
Winslow RD over Trib W Fork Cedar River	Poor condition + traffic exposure	Poor	255	1966
6th ST over Elk Run Creek	Poor condition + traffic exposure	Poor	209	1900

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.