Bonner County Bridge Report Card

Bonner County scores 67 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D67 / 100

Local infrastructure snapshot

Bonner County, Idaho

Bonner County has 104 bridges in the National Bridge Inventory, with 11 rated poor and 5 rated scour-critical. Its poor-condition share of 10.6% is above the 5.4% statewide average. Poor-condition bridges carry about 5,800 daily vehicle crossings.

104Total Bridges

11Poor (10.6%)

55Fair (52.9%)

5Scour-Critical

Quote-Ready Local Facts

10.6%of county bridges are in poor condition, compared with 5.4% statewide and 6.7% nationally.

5,800daily vehicle crossings are on poor-condition bridges in the county.

5bridges are rated scour-critical, or 4.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Bonner County a Bridge Condition Exposure Score of 67/100 (D). The county has 104 bridges in the National Bridge Inventory, including 11 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 5,800 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	10.6%	21.2
Poor-condition traffic exposure	25	2.5% of measured traffic	1.9
Scour-critical bridge share	20	4.8%	9.6
Average age vs national baseline	10	42 years vs 48 nationally	0.0
Traffic-data completeness	5	232,000 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	10.6%
State Poor-Condition Share	5.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	4.8%
Average Bridge Age	42 years
Poor-Condition Traffic Exposure	5,800 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeUS 2 over Priest River — 3,100 vehicles/day Oldest Listed BridgeSH 57 over Lower W.branch Priest R. — built in 1936 All County BridgesBrowse every bridge record in Bonner County.

Top Bridges to Watch in Bonner County

Bridge	Reason	Condition	Daily Traffic	Year Built
US 2 over Priest River	Poor condition + traffic exposure	Poor	3,100	1962
S5786;colburn Culv over Grouse Creek	Poor condition + traffic exposure	Poor	870	1941
Colburn Culver RD over Pack River	Poor condition + traffic exposure	Poor	870	1941
E Shore Road over Hunt Creek	Poor condition + traffic exposure	Poor	430	1975
Rapid Lightning RD over Rapid Lightning Creek	Poor condition + traffic exposure	Poor	280	1970
Fs Route No. 419 over Morris Creek	Poor condition + traffic exposure	Poor	50	1952
Fs Route No. 312 over Upper W. Branch	Poor condition + traffic exposure	Poor	50	1954
Fs Route No. 308 over Kalispell Creek	Poor condition + traffic exposure	Poor	50	1955
Fs Route No. 2706 over Granite Creek	Poor condition + traffic exposure	Poor	50	1964
East River Loop over N.fk.east River	Poor condition + traffic exposure	Poor	30	1939

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.