Marshall County Bridge Report Card

Marshall County scores 43 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F43 / 100

Local infrastructure snapshot

Marshall County, Iowa

Marshall County has 303 bridges in the National Bridge Inventory, with 130 rated poor and 5 rated scour-critical. Its poor-condition share of 42.9% is above the 18.6% statewide average. Poor-condition bridges carry about 48,407 daily vehicle crossings.

303Total Bridges

130Poor (42.9%)

73Fair (24.1%)

5Scour-Critical

Quote-Ready Local Facts

42.9%of county bridges are in poor condition, compared with 18.6% statewide and 6.7% nationally.

48,407daily vehicle crossings are on poor-condition bridges in the county.

5bridges are rated scour-critical, or 1.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Marshall County a Bridge Condition Exposure Score of 43/100 (F). The county has 303 bridges in the National Bridge Inventory, including 130 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 48,407 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	42.9%	40.0
Poor-condition traffic exposure	25	13.8% of measured traffic	10.3
Scour-critical bridge share	20	1.7%	3.3
Average age vs national baseline	10	55 years vs 48 nationally	3.0
Traffic-data completeness	5	351,166 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	42.9%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.7%
Average Bridge Age	55 years
Poor-Condition Traffic Exposure	48,407 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeSo Center ST over Linn Creek — 10,448 vehicles/day Oldest Listed BridgeW State ST over Drainage — built in 1900 All County BridgesBrowse every bridge record in Marshall County.

Top Bridges to Watch in Marshall County

Bridge	Reason	Condition	Daily Traffic	Year Built
Local over Branch North Timber Crk	Poor condition + traffic exposure	Poor	41	1924
FM over Creek	Poor condition + traffic exposure	Poor	25	1918
Local over Davisons Creek	Poor condition + traffic exposure	Poor	20	1978
Local over Brush Creek	Poor condition + traffic exposure	Poor	16	1917
Local over Burnett CR	Poor condition + traffic exposure	Poor	5	1917
So Center ST over Linn Creek	Poor condition + traffic exposure	Poor	10,448	1951
So Center ST over Rr And Madison ST	Poor condition + traffic exposure	Poor	9,491	1951
S. 18th AVE over Over Up Rr	Poor condition + traffic exposure	Poor	6,813	1980
Local over Up Rr & Lynn Ck	Poor condition + traffic exposure	Poor	3,584	1971
FM over Iowa River	Poor condition + traffic exposure	Poor	2,838	1955

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.