Lake County Bridge Report Card

Lake 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

Lake County, Montana

Lake County has 116 bridges in the National Bridge Inventory, with 13 rated poor and 2 rated scour-critical. Its poor-condition share of 11.2% is above the 7.4% statewide average. Poor-condition bridges carry about 13,178 daily vehicle crossings.

116Total Bridges

13Poor (11.2%)

33Fair (28.4%)

2Scour-Critical

Quote-Ready Local Facts

11.2%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

13,178daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 1.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Lake County a Bridge Condition Exposure Score of 70/100 (C). The county has 116 bridges in the National Bridge Inventory, including 13 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 13,178 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	11.2%	22.4
Poor-condition traffic exposure	25	5.1% of measured traffic	3.8
Scour-critical bridge share	20	1.7%	3.4
Average age vs national baseline	10	28 years vs 48 nationally	0.0
Traffic-data completeness	5	260,067 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	11.2%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.7%
Average Bridge Age	28 years
Poor-Condition Traffic Exposure	13,178 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeIRR - US 93 over Nine Pipe Reservoir — 8,158 vehicles/day Oldest Listed BridgeFish Hatchery RD over Post Creek 075 — built in 1920 All County BridgesBrowse every bridge record in Lake County.

Top Bridges to Watch in Lake County

Bridge	Reason	Condition	Daily Traffic	Year Built
IRR - US 93 over Nine Pipe Reservoir	Poor condition + traffic exposure	Poor	8,158	1933
S Main AVE over Mission Creek 052	Poor condition + traffic exposure	Poor	2,233	1929
S 83 Fh 15 over Lost Creek	Poor condition + traffic exposure	Poor	1,246	1953
Glover RD over Pablo 3a Canal 037	Poor condition + traffic exposure	Poor	471	1985
Light RD over Pablo 31a Canal 036	Poor condition + traffic exposure	Poor	292	2009
Rocky Butte RD over Crow Creek 070	Poor condition + traffic exposure	Poor	128	1986
Red Barn RD over Little Bitterroot Rv 064	Poor condition + traffic exposure	Poor	100	1960
Seifert RD over Pablo A Canal 083	Poor condition + traffic exposure	Poor	100	1960
Allison RD over Pablo Feeder Canal 046	Poor condition + traffic exposure	Poor	100	1960
Jocko Canyon RD over Jocko River 011	Poor condition + traffic exposure	Poor	100	1975

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.