Boone County Bridge Report Card

Boone County scores 48 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F48 / 100

Local infrastructure snapshot

Boone County, Iowa

Boone County has 134 bridges in the National Bridge Inventory, with 38 rated poor and 1 rated scour-critical. Its poor-condition share of 28.4% is above the 18.6% statewide average. Poor-condition bridges carry about 3,566 daily vehicle crossings.

134Total Bridges

38Poor (28.4%)

58Fair (43.3%)

1Scour-Critical

Quote-Ready Local Facts

28.4%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

3,566daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 0.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Boone County a Bridge Condition Exposure Score of 48/100 (F). The county has 134 bridges in the National Bridge Inventory, including 38 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 3,566 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	28.4%	40.0
Poor-condition traffic exposure	25	3.2% of measured traffic	2.4
Scour-critical bridge share	20	0.7%	1.5
Average age vs national baseline	10	68 years vs 48 nationally	8.1
Traffic-data completeness	5	111,763 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	28.4%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.7%
Average Bridge Age	68 years
Poor-Condition Traffic Exposure	3,566 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFM over Des Moines River — 769 vehicles/day Oldest Listed BridgeLocal over Big Creek — built in 1900 All County BridgesBrowse every bridge record in Boone County.

Top Bridges to Watch in Boone County

Bridge	Reason	Condition	Daily Traffic	Year Built
FM over Ioway Creek	Poor condition + traffic exposure	Poor	50	1949
FM over Des Moines River	Poor condition + traffic exposure	Poor	769	1972
FM over Bluff Creek	Poor condition + traffic exposure	Poor	718	1957
FM over Des Moines River	Poor condition + traffic exposure	Poor	709	1955
FM over Trib. Of Beaver Creek	Poor condition + traffic exposure	Poor	279	1948
Local over Big Creek	Poor condition + traffic exposure	Poor	90	1900
FM over Des Moines River	Poor condition + traffic exposure	Poor	80	1909
FM over Tributary Beaver Creek	Poor condition + traffic exposure	Poor	80	1962
Local over Trib.des Moines River	Poor condition + traffic exposure	Poor	71	1900
Local over Big Creek	Poor condition + traffic exposure	Poor	50	1915

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.