Grundy County Bridge Report Card

Grundy County scores 49 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F49 / 100

Local infrastructure snapshot

Grundy County, Iowa

Grundy County has 288 bridges in the National Bridge Inventory, with 77 rated poor and 6 rated scour-critical. Its poor-condition share of 26.7% is above the 18.6% statewide average. Poor-condition bridges carry about 18,802 daily vehicle crossings.

288Total Bridges

77Poor (26.7%)

91Fair (31.6%)

6Scour-Critical

Quote-Ready Local Facts

26.7%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

18,802daily vehicle crossings are on poor-condition bridges in the county.

6bridges are rated scour-critical, or 2.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Grundy County a Bridge Condition Exposure Score of 49/100 (F). The county has 288 bridges in the National Bridge Inventory, including 77 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 18,802 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	26.7%	40.0
Poor-condition traffic exposure	25	8.8% of measured traffic	6.6
Scour-critical bridge share	20	2.1%	4.2
Average age vs national baseline	10	43 years vs 48 nationally	0.0
Traffic-data completeness	5	214,178 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	26.7%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.1%
Average Bridge Age	43 years
Poor-Condition Traffic Exposure	18,802 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeIa 14 over Black Hawk Creek — 3,230 vehicles/day Oldest Listed BridgeIa 57 over Drainage Ditch — built in 1900 All County BridgesBrowse every bridge record in Grundy County.

Top Bridges to Watch in Grundy County

Bridge	Reason	Condition	Daily Traffic	Year Built
FM over Branch Beaver Creek	Poor condition + traffic exposure	Poor	619	1968
Local over Branch Wolf Creek	Poor condition + traffic exposure	Poor	44	1915
Local Road over Middle Fork Beaver Creek	Poor condition + traffic exposure	Poor	39	1948
Ia 14 over Black Hawk Creek	Poor condition + traffic exposure	Poor	3,230	1931
FM over Blackhawk Creek	Poor condition + traffic exposure	Poor	1,935	1971
First ST over Blackhawk Creek	Poor condition + traffic exposure	Poor	1,429	1977
First ST over Blackhawk Creek	Poor condition + traffic exposure	Poor	1,429	1977
FM over Wolf Creek Branch	Poor condition + traffic exposure	Poor	1,394	1975
FM over Creek	Poor condition + traffic exposure	Poor	707	1966
FM over Black Hawk Creek	Poor condition + traffic exposure	Poor	687	1979

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.