Mineral County Bridge Report Card

Mineral 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

Mineral County, Montana

Mineral County has 153 bridges in the National Bridge Inventory, with 17 rated poor and 2 rated scour-critical. Its poor-condition share of 11.1% is above the 7.4% statewide average. Poor-condition bridges carry about 13,205 daily vehicle crossings.

153Total Bridges

17Poor (11.1%)

99Fair (64.7%)

2Scour-Critical

Quote-Ready Local Facts

11.1%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

13,205daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 1.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Mineral County a Bridge Condition Exposure Score of 70/100 (C). The county has 153 bridges in the National Bridge Inventory, including 17 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 13,205 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	11.1%	22.2
Poor-condition traffic exposure	25	3.9% of measured traffic	2.9
Scour-critical bridge share	20	1.3%	2.6
Average age vs national baseline	10	54 years vs 48 nationally	2.5
Traffic-data completeness	5	337,051 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	11.1%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.3%
Average Bridge Age	54 years
Poor-Condition Traffic Exposure	13,205 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI 90 over Sep Elizabeth LN — 4,088 vehicles/day Oldest Listed BridgeNo Data Entered over ST Regis River — built in 1900 All County BridgesBrowse every bridge record in Mineral County.

Top Bridges to Watch in Mineral County

Bridge	Reason	Condition	Daily Traffic	Year Built
RD 320 over Cedar CR	Poor condition + traffic exposure	Poor	50	1959
I 90 over Sep Elizabeth LN	Poor condition + traffic exposure	Poor	4,088	1965
I 90 over Clark Fork River	Poor condition + traffic exposure	Poor	4,088	1965
I 90 over Clark Fork River	Poor condition + traffic exposure	Poor	3,719	1984
Old HWY 10 W over Clark Fork 054	Poor condition + traffic exposure	Poor	356	1932
S Frontage RD W over Clark Fork 053	Poor condition + traffic exposure	Poor	174	1916
Old HWY 10 E over ST Regis River 059	Poor condition + traffic exposure	Poor	140	1937
Mullan RD E over Nemote Creek 006	Poor condition + traffic exposure	Poor	100	1931
Sloway Frntge RD E over Abandoned Rr 001	Poor condition + traffic exposure	Poor	100	1956
RD 388 over Cedar CR	Poor condition + traffic exposure	Poor	50	1954

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.