Prairie County Bridge Report Card

Prairie County scores 65 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D65 / 100

Local infrastructure snapshot

Prairie County, Montana

Prairie County has 46 bridges in the National Bridge Inventory, with 5 rated poor and 1 rated scour-critical. Its poor-condition share of 10.9% is above the 7.4% statewide average. Poor-condition bridges carry about 1,439 daily vehicle crossings.

46Total Bridges

5Poor (10.9%)

37Fair (80.4%)

1Scour-Critical

Quote-Ready Local Facts

10.9%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

1,439daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 2.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Prairie County a Bridge Condition Exposure Score of 65/100 (D). The county has 46 bridges in the National Bridge Inventory, including 5 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 1,439 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	10.9%	21.7
Poor-condition traffic exposure	25	3.4% of measured traffic	2.5
Scour-critical bridge share	20	2.2%	4.3
Average age vs national baseline	10	64 years vs 48 nationally	6.5
Traffic-data completeness	5	42,655 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	10.9%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.2%
Average Bridge Age	64 years
Poor-Condition Traffic Exposure	1,439 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeOld HWY 10 W over Williams Coulee 007 — 507 vehicles/day Oldest Listed BridgeMilwaukee RD over Yellowstone River 030 — built in 1907 All County BridgesBrowse every bridge record in Prairie County.

Top Bridges to Watch in Prairie County

Bridge	Reason	Condition	Daily Traffic	Year Built
Old HWY 10 W over Williams Coulee 007	Poor condition + traffic exposure	Poor	507	1930
S 253 over Cedar Creek	Poor condition + traffic exposure	Poor	404	1935
S 253 over Drainage	Poor condition + traffic exposure	Poor	368	1940
Cb Route RD over Br Main Canal 035	Poor condition + traffic exposure	Poor	80	1928
Cb Route RD over Br Main Canal 036	Poor condition + traffic exposure	Poor	80	1938
Milwaukee RD over Yellowstone River 030	Scour-critical foundation rating	Fair	37	1907
I 94 over Ash Creek	High traffic	Fair	3,878	1969
I 94 over Int Powder River	High traffic	Fair	3,045	1971
I 94 over Rr	High traffic	Fair	2,219	1977
I 94 over Yellowstone River	High traffic	Fair	2,219	1978

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.