Lewis and Clark County Bridge Report Card

Lewis and Clark County scores 82 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B82 / 100

Local infrastructure snapshot

Lewis and Clark County, Montana

Lewis and Clark County has 204 bridges in the National Bridge Inventory, with 11 rated poor and 5 rated scour-critical. Its poor-condition share of 5.4% is at or below the 7.4% statewide average. Poor-condition bridges carry about 13,274 daily vehicle crossings.

204Total Bridges

11Poor (5.4%)

75Fair (36.8%)

5Scour-Critical

Quote-Ready Local Facts

5.4%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

13,274daily vehicle crossings are on poor-condition bridges in the county.

5bridges are rated scour-critical, or 2.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Lewis and Clark County a Bridge Condition Exposure Score of 82/100 (B). The county has 204 bridges in the National Bridge Inventory, including 11 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 13,274 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	5.4%	10.8
Poor-condition traffic exposure	25	3.1% of measured traffic	2.3
Scour-critical bridge share	20	2.5%	4.9
Average age vs national baseline	10	46 years vs 48 nationally	0.0
Traffic-data completeness	5	428,852 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	5.4%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.5%
Average Bridge Age	46 years
Poor-Condition Traffic Exposure	13,274 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeLincoln RD over Int Lincoln-i 15 — 7,492 vehicles/day Oldest Listed BridgeS Howie ST over Reeders Alley 001 — built in 1881 All County BridgesBrowse every bridge record in Lewis and Clark County.

Top Bridges to Watch in Lewis and Clark County

Bridge	Reason	Condition	Daily Traffic	Year Built
Pishkun Road over Sun River	Poor condition + traffic exposure	Poor	40	1916
Lincoln RD over Int Lincoln-i 15	Poor condition + traffic exposure	Poor	7,492	1962
Frontage Road 295 over Ten Mile Creek 071	Poor condition + traffic exposure	Poor	1,929	1962
S Cruse AVE over Pedestrian Underpass	Poor condition + traffic exposure	Poor	1,548	1972
S 200 over Stockpass	Poor condition + traffic exposure	Poor	1,432	1949
Craig Frontage RD over Missouri River 054	Poor condition + traffic exposure	Poor	484	1933
Birdtail RD over Flat Creek 036	Poor condition + traffic exposure	Poor	100	1901
Lovers Lane over Elk Creek 041	Poor condition + traffic exposure	Poor	100	1914
Fdr #8983 over N Fk Sun River	Poor condition + traffic exposure	Poor	99	1927
Nfsr 495 over Telegraph Creek	Poor condition + traffic exposure	Poor	30	1950

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.