Sweet Grass County Bridge Report Card

Sweet Grass 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

Sweet Grass County, Montana

Sweet Grass County has 94 bridges in the National Bridge Inventory, with 6 rated poor and 2 rated scour-critical. Its poor-condition share of 6.4% is at or below the 7.4% statewide average. Poor-condition bridges carry about 3,123 daily vehicle crossings.

94Total Bridges

6Poor (6.4%)

58Fair (61.7%)

2Scour-Critical

Quote-Ready Local Facts

6.4%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

3,123daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 2.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Sweet Grass County a Bridge Condition Exposure Score of 82/100 (B). The county has 94 bridges in the National Bridge Inventory, including 6 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 3,123 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	6.4%	12.8
Poor-condition traffic exposure	25	1.5% of measured traffic	1.2
Scour-critical bridge share	20	2.1%	4.3
Average age vs national baseline	10	48 years vs 48 nationally	0.0
Traffic-data completeness	5	203,430 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	6.4%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.1%
Average Bridge Age	48 years
Poor-Condition Traffic Exposure	3,123 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeS 91 over Boulder River Overflow — 2,133 vehicles/day Oldest Listed BridgeMcleod Main ST over West Boulder River 025 — built in 1912 All County BridgesBrowse every bridge record in Sweet Grass County.

Top Bridges to Watch in Sweet Grass County

Bridge	Reason	Condition	Daily Traffic	Year Built
S 91 over Boulder River Overflow	Poor condition + traffic exposure	Poor	2,133	1937
US 191 over Rye Creek	Poor condition + traffic exposure	Poor	661	1947
Mcleod Main ST over West Boulder River 025	Poor condition + traffic exposure	Poor	100	1912
Bointer RD over Sweet Grass Creek 044	Poor condition + traffic exposure	Poor	100	1970
Upper Deer CR RD over Upper Deer Creek 028	Poor condition + traffic exposure	Poor	100	1975
Old US 10 over Work Creek 041	Poor condition + traffic exposure	Poor	29	1932
Swamp Creek RD over Big Timber Creek	Scour-critical foundation rating	Good	100	2019
Bridger Creek Road over Bridger Creek	Scour-critical foundation rating	Good	100	2022
I 90 over Spring Creek	High traffic	Fair	12,306	1980
I 90 over Work Creek	High traffic	Fair	10,845	1972

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.