Home › Montana › Granite County › All bridges

Every bridge in Granite County, Montana

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

73 inventoried bridges, busiest first

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

Granite County, Montana, has 73 bridges in the 2025 National Bridge Inventory: 28 rated good, 36 fair, and 9 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
I 90 over Clark Fork River	1970	13,081	Poor
I 90 over Drainage	1971	13,081	Good
I 90 over Harvey Creek	1970	13,081	Good
I 90 over Rattler Gulch	1971	13,081	Fair
I 90 over Sep Bearmouth Road	1970	13,081	Good
I 90 over Clark Fork River	1970	11,802	Fair
I 90 over Int Bearmouth	1970	6,541	Fair
I 90 over Int Bearmouth	1970	6,541	Good
I 90 over Int E Drummond	1966	4,666	Fair
I 90 over Int E Drummond	1966	4,666	Good
I 90 over Sep S-271	1966	4,666	Good
I 90 over Sep S-271	1966	4,666	Fair
I 90 over Int W Drummond	1966	4,361	Fair
I 90 over Int W Drummond	1966	4,361	Fair
I 90 over Sep Edwards Gulch Road	1966	4,361	Good
I 90 over Sep Edwards Gulch Road	1966	4,361	Good
S 1 over Fred Burr Creek	1931	1,695	Fair
S 1 over Abandoned Railroad	1966	1,354	Fair
S 1 over Clark Fork	1966	1,354	Poor
S 1 over RR	1966	1,354	Fair
S 1 over Willow Creek	1999	1,325	Good
S 1 over Boulder Creek	1986	1,144	Fair
S 1 over Flint Creek	1931	1,144	Fair
Rock Creek Rd over Ranch Creek 009	1977	603	Fair
Upper Rock CR Rd over Rock Creek 010	1976	603	Good
Upper Rock CR Rd over Stony Creek 011	1999	603	Fair
Walberg Ranch Ln over Rock Creek 054	1987	603	Good
Main St over Bergman Slough 019	1934	457	Fair
Many Glacier Road over Windy Creek	1931	452	Fair
S Main Street over Clark Fork River 020	1934	371	Poor
Marshall Creek Rd over Flint Creek	1956	352	Fair
Mt 38-skalkaho Rd over Rock Creek 013	1989	278	Good
N Sandin Ranch Ln over Middle Fork Rock CR 032	2004	278	Good
Frontage Road 153 over Clark Fork River 034	1970	272	Fair
Mt 38-skalkaho Rd over W Fork Rock Creek 006	1991	223	Good
Mt 38-skalkaho Rd over W Fork Rock Creek 012	1974	223	Good
S 512 over Flint Creek	1964	222	Good
Moose Lake Rd over E Fork Rock Creek 030	1950	186	Good
Marshall Creek Rd over Rock Creek	1959	161	Poor
Bear Gulch Rd over Clark Fork River 002	1986	130	Poor
Black Pine Road over Flint Creek 007	1991	100	Good
Douglas Creek Road over Flint Creek 004	2015	100	Good
Gold Coin Road over Flint Creek 017	1984	100	Fair
Henderson Creek Ro over Flint Creek 035	2013	100	Good
I 90 over Antelope Creek	1971	100	Poor
Maxville Rd over Boulder Creek 014	2012	100	Good
Metesh Lane over Flint Creek 055	2009	100	Good
Mullan Rd E over Flint Creek 001	1998	100	Fair
Mullan Rd E over Flint Creek Overflow 084	1998	100	Good
Ross Fork Road over Middle Fork Rock CR 021	1991	100	Good
Grizzle Camp Rd over Ranch CR	1958	50	Fair
No Data Entered over Boulder CR	1949	50	Poor
No Data Entered over Bowles CR	1971	50	Fair
No Data Entered over Copper CR	1956	50	Fair
No Data Entered over Flint Creek	2001	50	Fair
No Data Entered over Hogback Creek	2008	50	Fair
No Data Entered over Middle Fork Rock CR	1956	50	Fair
No Data Entered over Ross Fork	1962	50	Fair
No Data Entered over Ross Fork	1967	50	Poor
No Data Entered over Spillway	1958	50	Fair
No Data Entered over Swamp Gul	1987	50	Poor
No Data Entered over West Fork Rock CR	1965	50	Fair
Cable Mtn Campgrou over N Fk Flint Creek	2015	40	Good
No Data Entered over Gold Creek	1975	40	Fair
No Data Entered over Meadow CR	1978	40	Good
No Data Entered over Middle Fork Rock CR	1965	40	Fair
No Data Entered over Middle Fork Rock CR	1965	40	Fair
No Data Entered over Ross Fork	1961	40	Fair
No Data Entered over West Fork Rock CR	1969	40	Fair
Road 358 over Harvey Creek	1984	40	Good
Road 5156 over Upper Willow CR	1968	40	Fair
Rock Creek Road over Cougar Creek	2008	40	Good
4638: Scotchman Gu over Upper Willow Creek	1980	25	Fair

Source: FHWA National Bridge Inventory, 2025.

Granite County bridge conditions · Montana bridges by county.

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