Sheridan County Bridge Report Card

Sheridan County scores 78 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C78 / 100

Local infrastructure snapshot

Sheridan County, Montana

Sheridan County has 66 bridges in the National Bridge Inventory, with 3 rated poor and 3 rated scour-critical. Its poor-condition share of 4.5% is at or below the 7.4% statewide average. Poor-condition bridges carry about 697 daily vehicle crossings.

66Total Bridges

3Poor (4.5%)

52Fair (78.8%)

3Scour-Critical

Quote-Ready Local Facts

4.5%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

697daily vehicle crossings are on poor-condition bridges in the county.

3bridges are rated scour-critical, or 4.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Sheridan County a Bridge Condition Exposure Score of 78/100 (C). The county has 66 bridges in the National Bridge Inventory, including 3 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 697 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	4.5%	9.1
Poor-condition traffic exposure	25	5.3% of measured traffic	4.0
Scour-critical bridge share	20	4.5%	9.1
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	13,036 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	4.5%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	4.5%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	697 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeS 5 over Dahl Creek — 309 vehicles/day Oldest Listed BridgeS 5 over Dahl Creek — built in 1939 All County BridgesBrowse every bridge record in Sheridan County.

Top Bridges to Watch in Sheridan County

Bridge	Reason	Condition	Daily Traffic	Year Built
S 5 over Dahl Creek	Poor condition + traffic exposure	Poor	309	1939
S 5 over Main Creek	Poor condition + traffic exposure	Poor	309	1939
W Lake RD over Big Muddy Creek 046	Poor condition + traffic exposure	Poor	79	1950
W Reserve HWY over Big Muddy Creek Overflow	Scour-critical foundation rating	Fair	151	1949
Shippe Canyon RD over Big Muddy Creek 032	Scour-critical foundation rating	Fair	117	1970
Lake Creek RD over Lake Creek 078	Scour-critical foundation rating	Good	100	1983
S 5 over Marron Creek	High traffic	Fair	1,559	1983
S 16 over Ator Creek	High traffic	Fair	1,559	1984
S 5 over Antelope Creek	High traffic	Good	1,120	1986
S 16 over Medicine Lake	High traffic	Fair	891	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.