Sioux County Bridge Report Card

Sioux County scores 93 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A93 / 100

Local infrastructure snapshot

Sioux County, Iowa

Sioux County has 448 bridges in the National Bridge Inventory, with 14 rated poor and 0 rated scour-critical. Its poor-condition share of 3.1% is at or below the 18.6% statewide average. Poor-condition bridges carry about 3,279 daily vehicle crossings.

448Total Bridges

14Poor (3.1%)

153Fair (34.2%)

0Scour-Critical

Quote-Ready Local Facts

3.1%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

3,279daily 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 Sioux County a Bridge Condition Exposure Score of 93/100 (A). The county has 448 bridges in the National Bridge Inventory, including 14 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 3,279 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	3.1%	6.2
Poor-condition traffic exposure	25	1.3% of measured traffic	0.9
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	44 years vs 48 nationally	0.0
Traffic-data completeness	5	261,631 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	3.1%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	44 years
Poor-Condition Traffic Exposure	3,279 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFM over Floyd River — 813 vehicles/day Oldest Listed BridgeGarfield ST over Drainage — built in 1900 All County BridgesBrowse every bridge record in Sioux County.

Top Bridges to Watch in Sioux County

Bridge	Reason	Condition	Daily Traffic	Year Built
FM over Floyd River	Poor condition + traffic exposure	Poor	813	1954
FM over Indian Creek	Poor condition + traffic exposure	Poor	649	1967
B46 over No Name Creek	Poor condition + traffic exposure	Poor	538	1966
FM over Indian Creek	Poor condition + traffic exposure	Poor	469	1965
14th ST over Creamery Creek	Poor condition + traffic exposure	Poor	257	1961
Garfield ST over Drainage	Poor condition + traffic exposure	Poor	232	1900
Local over Small Stream	Poor condition + traffic exposure	Poor	110	1900
FM over Dry Run	Poor condition + traffic exposure	Poor	71	1977
FM over Small Stream	Poor condition + traffic exposure	Poor	34	1962
Local over Small	Poor condition + traffic exposure	Poor	34	1978

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.