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Every bridge in Fallon County, Montana

Name: Every bridge in Fallon County, Montana
Creator: Bridge Report Card
License: https://creativecommons.org/publicdomain/zero/1.0/

38 inventoried bridges, busiest first

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Fallon County, Montana, has 38 bridges in the 2025 National Bridge Inventory: 17 rated good, 19 fair, and 2 poor (as of August 20, 2026).
This index lists every one of them, busiest first; each links to its own condition record.

Bridge	Built	Vehicles/day	Condition
Lake St over Baker Lake Overflow	2009	2,393	Good
S 7-main St N over Sandstone Creek	1941	2,209	Poor
US 12 over Drainage	1998	1,600	Fair
US 12 over Timber Creek	1998	825	Fair
US 12 over Sandstone Creek	1998	753	Fair
US 12 over RR	1968	696	Fair
US 12 over Hay Creek	1932	516	Fair
US 12 over O`fallon Creek	1971	516	Fair
US 12 over Sandstone Creek	1971	498	Fair
Main St S over Sandstone Creek	1964	119	Fair
Ag Lane over Sandstone Creek 056	2014	100	Good
Ash CR Rd E over Beaver Creek 031	2003	100	Good
Ash CR Rd E over E Fork Beaver Creek 055	2003	100	Good
Bonnievale Rd over Sandstone Creek	2023	100	Good
Cabin CR Rd over Cabin Creek 053	2012	100	Fair
County Road 137 over S Fk Sandstone Creek 025	2011	100	Fair
County Road 141 over S Fk Sandstone Creek 048	2012	100	Good
County Road 154 over Little Beaver Creek 015	2014	100	Fair
County Road 178 over Little Beaver Creek 055	2013	100	Good
Dry Fork Rd over Pennel Creek 023	2016	100	Good
Prairie View Dr over Sandstone Creek 059	2012	100	Good
Sandstone Rd over Sandstone Spillway	1974	100	Fair
Snake Trail over Drainage 054	2003	100	Fair
Sunny Bank Rd over S Fk Sandstone Creek 044	2013	100	Fair
Webster Rd over N Fk Coal Bank Creek 004	2017	100	Good
Willard Rd W over O`fallon Creek 005	1995	100	Fair
Plevna Rd N over Pennel Creek	2020	78	Good
Plevna Rd S over South Fork Sandstone CR	1964	76	Fair
S 322 over Little Beaver Creek	1992	42	Fair
Ismay Rd over Cottonwood Creek	2023	38	Good
Anticline Rd over Pennel Creek 013	2009	32	Good
Cabin Creek Loop over Cabin Creek 057	1980	32	Poor
S 336-ollie Rd over Fork of Beaver Creek	2016	31	Good
Westmore Rd over Pennel Creek 022	1991	30	Good
Westmore Rd over Sandstone Creek 024	2016	30	Fair
S 336-ollie Rd over Beaver Creek	2016	28	Good
Webster Rd over Little Beaver Creek	1978	26	Good
County Road 054 over Sandstone Creek 034	2005	11	Fair

Source: FHWA National Bridge Inventory, 2025.

Fallon County bridge conditions · Montana bridges by county.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.