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Every bridge in Cascade County, Montana

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

185 inventoried bridges, busiest first

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

Cascade County, Montana, has 185 bridges in the 2025 National Bridge Inventory: 77 rated good, 97 fair, and 11 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
Central Ave over Missouri River-ped Trail	1980	24,549	Good
15TH St N-us 87 over Missouri R-rivers Trail	1962	14,369	Fair
9TH St N over Missouri River	1996	14,024	Fair
6TH St SW over Sun River	1980	13,800	Fair
US 87-mt 3-mt 200 over Missouri River-u5205-rr	1983	13,666	Fair
US 89-mt 3-mt 200 over Missouri River-u5205-rr	1951	13,666	Fair
I 315S over Int I 15	1967	12,651	Fair
Central Ave W over Int Central Ave W-i 15	1967	12,316	Fair
Branch I 15-u.s. 8 over RR	1946	6,326	Good
Branch I 15-u.s. 8 over RR	1967	6,326	Good
I 315S over Fau 5225-14th St SW	1967	6,326	Good
I 315S over Fau 5225-14th St SW	1967	6,326	Good
Central Ave W over Galt Ave-rr	1967	6,158	Fair
Central Ave W over Galt Ave-rr	1967	6,158	Fair
US 89 over Int Vaughn-i 15	1960	5,732	Fair
US 89 over Muddy Creek	2002	5,732	Good
US 89 over RR	2002	5,732	Good
I 315 S over Fau 5225-14th St SW	1997	5,330	Good
I 15 NB over Sun River	1966	5,254	Fair
I 15 SB over Sun River	1966	5,254	Fair
I 15 over Sep 5TH Ave SW	1967	5,254	Good
I 15 over Sep 5TH Ave SW	1967	5,254	Good
I 15 over Int Manchester	1960	5,227	Good
Overlook Dr over RR By Waterworks	2009	5,063	Good
Smelter Ave over 15TH St NE	1963	4,807	Fair
US 87-us 89 over Box Elder Creek	1989	4,614	Good
I 15 over Int Manchester	1960	4,555	Fair
Airport Dr over Int Gore Hill-i 15	1967	4,478	Fair
25TH St N over Abandoned Railroad	1914	4,262	Fair
I 15 over Int Emerson Jct-rr	1967	3,561	Good
I 15 over Int Emerson Jct-rr	1967	3,561	Good
Off Ramp to 14TH S over RR	1996	3,428	Good
I 15 over Int Ulm	1958	3,145	Fair
I 15 over Int Ulm	1969	3,145	Fair
I 15 over Sep County Road	1969	3,145	Good
I 15 over Sep County Road	1969	3,145	Good
US 87-us 89 over Belt Creek	2022	3,037	Good
S 200 over Mill Coulee Creek	1996	2,505	Good
S 200 over Sun River	1996	2,505	Fair
I 15 over Int N Cascade	1961	2,455	Good
I 15 over Int N Cascade	1977	2,455	Good
I 15 over Little Muddy Creek	1958	2,455	Good
I 15 over Little Muddy Creek	1958	2,455	Good
US 87 over Otter Creek	1959	2,314	Good
US 87 over Otter Creek	1959	2,314	Good
US 87 over Otter Creek	1959	2,314	Good
US 87 over Otter Creek	1959	2,314	Poor
US 87 over Otter Creek	1959	2,314	Good
US 87 over Otter Creek	1959	2,314	Fair
US 87 over Otter Creek	1959	2,314	Good
US 87 over Otter Creek	1959	2,314	Poor
US 87 over Otter Creek	1959	2,314	Poor
I 15 over Int Hardy-hardy Creek	1968	2,218	Good
I 15 over Int Hardy-hardy Creek	1968	2,218	Good
I 15 over Sep Old US 91	1961	2,218	Fair
I 15 over Sep Old US 91	1978	2,218	Good
I 15 over Sep Tintinger	1961	2,218	Fair
I 15 over Sep Tintinger	1978	2,218	Fair
I 15 over Int Dearborn-missouri R	1971	2,201	Fair
I 15 over Int Dearborn-missouri R	1971	2,201	Fair
I 15 over Missouri River	1971	2,201	Fair
I 15 over Missouri River	1971	2,201	Fair
I 15 over Missouri River-local	1971	2,201	Fair
I 15 over Missouri River-local	1971	2,201	Fair
I 15 over Rr-missouri River	1968	2,201	Fair
I 15 over Rr-missouri River	1968	2,201	Fair
I 15 over Int S Cascade	1961	2,190	Good
I 15 over Int S Cascade	1978	2,190	Good
I 15 over Sep Gunderson Rd	1972	2,026	Fair
I 15 over Sep Gunderson Rd	1972	2,026	Fair
I 15 over Sep Neuman Sch Rd	1972	2,026	Good
I 15 over Sep Neuman Sch Rd	1972	2,026	Good
US 89 over Greenfields South Canal	1960	1,757	Good
US 89 over Mill Coulee Canal	1940	1,757	Fair
Bridge Street over Belt Creek 012	2012	1,650	Good
Lower River Rd over Sand Coulee Creek	1937	1,597	Fair
34TH St NW over Sep 34TH St-i 15	1967	1,447	Good
US 89 over Mill Coulee Creek	1940	1,437	Fair
US 89 over Mill Coulee Creek	1940	1,437	Fair
Central Ave W over Sun River 056	1987	1,390	Good
Sun River Rd over Sep West Hill-i 15 127	1967	1,364	Poor
Giant Springs Rd over Rivers Edge Trail	2002	1,015	Good
US 89 Fh 32 over Belt Creek	1968	833	Poor
US 89 Fh 32 over Belt Creek	1968	833	Good
US 89 Fh 32 over Belt Creek	1968	706	Good
US 89 Fh 32 over Belt Creek	1968	706	Good
Ulm Vaughn Rd over Sun River 057	2013	699	Good
Millegan Rd over Missouri River	1983	553	Fair
Highwood Rd over Red Coulee	1941	552	Fair
Simms Fairfield Rd over Sun River	1983	475	Good
Highwood Rd over Belt Creek	2009	459	Good
US 89 Fh 32 over Belt Creek	1951	451	Good
US 89 Fh 32 over Belt Creek	1967	451	Good
US 89 Fh 32 over Dry Fork Belt Creek	2014	451	Good
Mt 21 over Fort Shaw Canal 110	1934	421	Fair
Mt 21 over Heppler Coulee 109	1934	421	Fair
Mt 21 over Simms Creek 112	1934	421	Fair
US 89 Fh 32 over Belt Creek	2001	387	Fair
Gordon Rd over Muddy Creek 042	1973	367	Fair
Old US 91 over Missouri River-rr 069	1931	316	Poor
Old US 91 over Novak Creek 005	1931	316	Fair
Old US 91 over Prewett Creek 070	1931	316	Fair
Millegan Rd over Drainage-stockpass	2000	294	Good
Millegan Rd over Smith River	1950	294	Fair
Millegan Rd over Smith River	1962	294	Good
Central Ave E over Missouri River	1954	289	Fair
Manchester Rd S over Sun River 055	2001	244	Good
Willow Creek Rd over Little Belt Creek 003	1938	158	Fair
Willow Creek Rd over Little Belt Creek 099	1950	158	Fair
Willow Creek Rd over Little Belt Creek 100	1950	158	Good
Central Ave over Belt Creek 084	1938	155	Fair
10TH Ln over Bench South Canal 048	1984	100	Fair
11TH Ln over Greenfield S Canal 047	2009	100	Fair
1ST Rd S over Mill Coulee Canal 046	2004	100	Fair
5TH Ln over Greenfield S Canal 045	2003	100	Fair
7TH Ln over Greenfield S Canal 065	1950	100	Fair
7TH Ln over Mill Coulee Canal 093	1950	100	Good
8TH Ln over Mill Coulee Canal 049	1950	100	Fair
Adel Rd over W Fork Hound Creek 120	1950	100	Fair
Armington Rd over Big Otter Creek 029	1954	100	Fair
Belt Park Rd over Belt Creek 019	1955	100	Fair
Blaine St over Sand Coulee Creek 087	1950	100	Good
Brown Rd over Sand Coulee Creek 088	1950	100	Fair
Carlson Rd over Flat Creek 034	1938	100	Fair
Castner Falls Rd over Bird Creek 038	1938	100	Fair
Cora Creek Rd over Cora Creek 075	1950	100	Fair
County Line Rd over Greenfield Canal 044	1973	100	Fair
County Line Rd over Greenfield S Canal 043	1982	100	Fair
E Highwood Rd over Belt Creek 002	1935	100	Fair
E Highwood Rd over Little Belt Creek 004	1971	100	Good
Evans Riceville Rd over Belt Creek 015	1962	100	Fair
Ewing Rd over Belt Creek 074	1973	100	Fair
Ewing Rd over Little Belt Creek 098	1973	100	Good
Frontage Road 614 over Int Sep I 15	1978	100	Good
Frontage Road 615 over Int Canyon-i 15	1968	100	Good
Hughesville Rd over Dry Fork Belt Creek 077	1962	100	Fair
Hughesville Rd over Dry Fork Belt Creek 078	1962	100	Fair
Hughesville Rd over Dry Fork Belt Creek 079	1962	100	Good
Hughesville Rd over Dry Fork Belt Creek 080	1962	100	Fair
Hughesville Rd over Dry Fork Belt Creek 101	1962	100	Good
Hughesville Rd over Dry Fork Belt Creek 103	1962	100	Fair
Jarvi Rd over Little Belt Creek 037	1971	100	Good
Johnson Rd over Sand Coulee Creek 076	2002	100	Good
Klock Rd over Castner Coulee 096	1938	100	Good
Lowrey Rd over Fort Shaw Canal 061	2001	100	Good
Lowrey Rd over Sun River 062	1960	100	Fair
Meyer Ave over Sand Coulee Creek 081	1950	100	Good
Mill Coulee Rd over Mill Coulee Canal 064	1920	100	Fair
N Fort Shaw Rd over Sun River 063	1998	100	Good
Old US Hwy 91 over Little Muddy Creek 090	1923	100	Poor
Old US Hwy 91 over Muddy Creek Slough 111	1923	100	Fair
Old Ulm Cascade Rd over Little Muddy Creek 067	1987	100	Fair
Old Ulm Cascade Rd over Sep I 15	1977	100	Good
Old Ulm Cascade Rd over Sep I 15	1970	100	Good
Parker Rd over Sun River Slough 060	1950	100	Fair
Powerline Rd over Drainage 025	1931	100	Fair
River Rd over Bird Creek 036	1940	100	Fair
Salem Rd over Belt Creek 071	1998	100	Good
Shaw Cutoff Rd over Little Muddy Creek 126	1933	100	Fair
Simms Ashuelot Rd over Blackfoot Coulee 053	1976	100	Fair
Simms Cascade Rd over Fort Shaw Canal 041	1938	100	Good
Truly Cutoff Rd over Smith River 033	1908	100	Fair
Nfsr 1049 over Belt Creek	1909	99	Fair
Nfsr 834 over Belt Creek	1909	99	Fair
Upper Millegan Rd over Hound Creek 028	1975	81	Good
Sheep CR Rd over Sheep Creek 097	1950	68	Poor
Sun R Cascade Rd over Little Muddy Creek 040	2004	67	Good
Nfsr 487 over S Fk Judith River	1958	65	Poor
Fdr 1122 over Belt Creek	1972	50	Fair
Fdr 267 over Chamberlain Creek	2002	50	Good
Fdr 267 over Jefferson Creek	1957	50	Poor
Fdr 3411 over Belt Creek	1962	50	Fair
Nfsr 613 over Dry Fork Belt Creek	1956	50	Fair
Nfsr 834 over Graveyard Gulch Creek	1953	50	Fair
Nfsr 834 over Harley Creek	1953	50	Fair
Nfsr 834 over Harley Creek	1953	50	Fair
Fdr 839 over Logging Creek	1956	46	Fair
Fdr 839 over Logging Creek	1956	46	Fair
Nfsr 839 over Belt Creek	1954	46	Poor
Anderson Rd over Int Gordon-i 15	1972	37	Fair
Boston Coulee Rd over Smith River 027	2004	30	Good
A-6 Lane over Belt Creek	1960	20	Fair
Horse Ranch Road over Armells Creek	2017	20	Good
Ashuelot Hill Rd over Bench South Canal 066	1950	19	Fair
County Road 242 over Otter Creek 125	1950	13	Fair

Source: FHWA National Bridge Inventory, 2025.

Cascade County bridge conditions · Montana bridges by county.

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