Butte County Bridge Report Card

Butte County scores 70 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C70 / 100

Local infrastructure snapshot

Butte County, Idaho

Butte County has 32 bridges in the National Bridge Inventory, with 1 rated poor and 3 rated scour-critical. Its poor-condition share of 3.1% is at or below the 5.4% statewide average. Poor-condition bridges carry about 491 daily vehicle crossings.

32Total Bridges

1Poor (3.1%)

22Fair (68.8%)

3Scour-Critical

Quote-Ready Local Facts

3.1%of county bridges are in poor condition, compared with 5.4% statewide and 6.7% nationally.

491daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 9.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Butte County a Bridge Condition Exposure Score of 70/100 (C). The county has 32 bridges in the National Bridge Inventory, including 1 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 491 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	2.3% of measured traffic	1.7
Scour-critical bridge share	20	9.4%	18.8
Average age vs national baseline	10	56 years vs 48 nationally	3.3
Traffic-data completeness	5	21,176 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	5.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	9.4%
Average Bridge Age	56 years
Poor-Condition Traffic Exposure	491 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeAdams Boulevard over Adams Drainage — 491 vehicles/day Oldest Listed Bridge2800 N over E.branch Big Lost River — built in 1920 All County BridgesBrowse every bridge record in Butte County.

Top Bridges to Watch in Butte County

Bridge	Reason	Condition	Daily Traffic	Year Built
Adams Boulevard over Adams Drainage	Poor condition + traffic exposure	Poor	491	1993
US 93 over Spring Creek	Scour-critical foundation rating	Good	2,600	1962
Stc 6749;2500n over Big Lost River	Scour-critical foundation rating	Fair	500	1926
Stc 6749; 2900n over Big Lost River	Scour-critical foundation rating	Fair	260	1926
US 20 over Inl Central Connector	High traffic	Fair	4,400	1993
US 20 over Big Lost River	High traffic	Good	2,700	1977
US 93 over Arco Canal	High traffic	Good	2,600	1962
US 93 over Big Lost River	High traffic	Fair	2,600	1962
US 93 over Big Lost River	High traffic	Fair	2,300	1958
Stc 6749; 3300w over Big Lost River	High traffic	Fair	290	1926

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.