Linn County Bridge Report Card

Linn County scores 84 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B84 / 100

Local infrastructure snapshot

Linn County, Iowa

Linn County has 511 bridges in the National Bridge Inventory, with 34 rated poor and 1 rated scour-critical. Its poor-condition share of 6.7% is at or below the 18.6% statewide average. Poor-condition bridges carry about 83,573 daily vehicle crossings.

511Total Bridges

34Poor (6.7%)

295Fair (57.7%)

1Scour-Critical

Quote-Ready Local Facts

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

83,573daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 0.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Linn County a Bridge Condition Exposure Score of 84/100 (B). The county has 511 bridges in the National Bridge Inventory, including 34 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 83,573 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	6.7%	13.3
Poor-condition traffic exposure	25	3.2% of measured traffic	2.4
Scour-critical bridge share	20	0.2%	0.4
Average age vs national baseline	10	38 years vs 48 nationally	0.0
Traffic-data completeness	5	2,581,879 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	6.7%
State Poor-Condition Share	18.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.2%
Average Bridge Age	38 years
Poor-Condition Traffic Exposure	83,573 vehicles/day

Bridges to Watch

Busiest Poor-Condition Bridge8th AVE over Indian Creek — 10,789 vehicles/day Oldest Listed BridgeSutton RD over Wapsipinicon River — built in 1879 All County BridgesBrowse every bridge record in Linn County.

Top Bridges to Watch in Linn County

Bridge	Reason	Condition	Daily Traffic	Year Built
8th AVE over Indian Creek	Poor condition + traffic exposure	Poor	10,789	1988
Edgewood RD NE over Cedar River & Rr	Poor condition + traffic exposure	Poor	10,268	1969
Center Point RD over Over Cc Rr	Poor condition + traffic exposure	Poor	9,703	1968
8th AVE over Cedar River	Poor condition + traffic exposure	Poor	9,382	1938
Covington RD over Silver Creek	Poor condition + traffic exposure	Poor	5,696	1955
Covington RD over Lone Tree Creek	Poor condition + traffic exposure	Poor	5,200	1925
C St. over Prairie Creek	Poor condition + traffic exposure	Poor	4,910	1964
J ST over Prairie Creek	Poor condition + traffic exposure	Poor	4,121	1964
E AVE Northwest over Cedar River	Poor condition + traffic exposure	Poor	3,461	1979
16th AVE EB over Over Up Rr & Street	Poor condition + traffic exposure	Poor	3,200	1937

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.