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Every bridge in Big Horn County, Montana

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

133 inventoried bridges, busiest first

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

Big Horn County, Montana, has 133 bridges in the 2025 National Bridge Inventory: 38 rated good, 90 fair, and 5 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 Irrigation Canal	1971	8,516	Fair
Irr-s 47 over Int W Hardin I 90	1970	5,396	Fair
Irr - I 90 over Int Dunmore	1959	4,473	Fair
Irr - I 90 over Int Dunmore	1959	4,473	Fair
Irr - I 90 over Bighorn River	1971	4,258	Good
Irr - I 90 over Bighorn River	1971	4,258	Fair
Irr - I 90 over Sarpy Road-s 384	1971	4,258	Fair
Irr - I 90 over Sarpy Road-s 384	1971	4,258	Fair
I 90 over Sep County Road	1972	3,946	Fair
I 90 over Sep County Road	1972	3,946	Fair
Irr - I 90 over Int Crow Agency	1959	3,889	Fair
Irr - I 90 over Int Crow Agency	1959	3,889	Fair
Irr - I 90 over Little Bighorn River	1949	3,889	Fair
Irr - I 90 over Little Bighorn River	1959	3,889	Fair
Irr - I 90 over RR (not In Use)	1971	3,853	Fair
Irr - I 90 over RR (not In Use)	1971	3,853	Fair
I 90 over Fly Creek	1972	3,736	Good
I 90 over Fly Creek	1972	3,736	Good
I 90 over Int Toluca County Road	1972	3,736	Fair
I 90 over Int Toluca County Road	1972	3,736	Good
I 90 over RR	1972	3,736	Fair
I 90 over RR	1972	3,736	Fair
Irr - US 212 over Muddy Creek	1974	2,811	Good
Irr - US 212 over Rosebud Creek	1992	2,811	Good
Irr - I 90 over Little Bighorn River	1956	2,693	Fair
Irr - I 90 over Little Bighorn River	1976	2,693	Fair
Irr - US 212 over Int Custer Batlfld I 90	1959	2,397	Fair
Irr - I 90 over Int Aberdeen	1985	2,193	Fair
Irr - I 90 over Int Aberdeen	1985	2,193	Fair
Irr - I 90 over Int Wyola-s 457	1985	2,193	Fair
Irr - I 90 over Int Wyola-s 457	1985	2,193	Fair
Irr - I 90 over Int Garryowen	1976	2,082	Fair
Irr - I 90 over Int Garryowen	1976	2,082	Fair
Irr - I 90 over Little Bighorn River	1956	2,082	Fair
Irr - I 90 over Little Bighorn River	1980	2,082	Good
Irr - I 90 over Sep County Road	1980	2,082	Fair
Irr - I 90 over Sep County Road	1980	2,082	Fair
Irr - I 90 over Sep County Road	1980	2,082	Fair
Irr - I 90 over Sep County Road	1980	2,082	Fair
Irr - I 90 over Sep Reno Creek Road	1980	2,082	Fair
Irr - I 90 over Sep Reno Creek Road	1980	2,082	Fair
Irr - I 90 over Int Lodge Grass	1980	2,013	Fair
Irr - I 90 over Int Lodge Grass	1980	2,013	Fair
Irr - I 90 over Owl Creek	1985	2,013	Good
Irr - I 90 over Owl Creek	1985	2,013	Fair
Irr - I 90 over Sep Local Road	1985	2,013	Fair
Irr - I 90 over Sep Local Road	1985	2,013	Fair
Irr - I 90 over Sep Local Road	1985	2,013	Fair
Irr - I 90 over Sep Local Road	1985	2,013	Fair
Irr - I 90 over Sep Local Road	1985	2,013	Fair
Irr - I 90 over Sep Local Road	1985	2,013	Fair
Irr-s 47-3rd St E over Int E Hardin I 90	1971	1,916	Fair
I 90 Frontage Rd over Bighorn River	2007	1,455	Fair
Irr Bia Rte 6 over Little Bighorn River	1999	1,000	Good
Irr - S 451 over Little Bighorn River	1980	915	Good
Irr - S 451 over Little Bighorn River	1955	915	Fair
Irr - S 313 over Bighorn River	1958	899	Fair
Irr - S 313 over Overflow Ditch	1988	899	Fair
Irr - S 313 over Two Leggin Canal	1989	899	Good
Irr - S 313 over Two Leggin Canal	1991	899	Good
Irr - S 313 over Williams Coulee	2021	899	Good
S 47 over Low Line Ditch	1989	852	Good
Irr - S 313 over Rotten Grass Creek	1983	621	Fair
Irr - S 313 over Soap Creek	1963	621	Good
Irr - S 314 over Squirrel Creek	1981	568	Fair
Old Hwy 87 over Fly Creek 090	2002	564	Fair
Old Hwy 87 over Peritsa Creek	2020	564	Good
Old Hwy 87 over RR 025	2006	564	Fair
Old Hwy 87 over Two Leggins Canal 0	1931	564	Poor
Irr - S 73 over Little Bighorn River	1980	548	Fair
Irr - S 451 over Lodge Grass Creek	1955	539	Fair
Sarpy Creek Rd over Little Bighorn River	1962	514	Fair
Irr - S 313 over Indian Service Canal	1962	503	Fair
Irr - S 314 over Spring Creek	1981	499	Fair
Irr Bia Rte 14 over Big Shoulder Creek	1963	440	Fair
Irr Bia Rte 1 over Big Horn Canal	2001	400	Good
Irr - S 314 over Davis Creek	1983	388	Good
Irr - S 314 over Rosebud Creek	1983	388	Fair
Irr - S 451 over Little Bighorn River	1950	382	Fair
Irr Bia Rte 91 over Big Horn River	1970	360	Fair
Irr Bia Rte 91 over Rotten Grass Creek	1970	350	Fair
Irr Bia Rte 16 over Lodge Grass Creek	1962	300	Fair
Irr - S 451 over Pass Creek	1949	299	Good
Irr - S 451 over Pass Creek	1949	299	Fair
S384 over Dry Creek	2023	220	Good
Sarpy Creek Rd over Tullock Creek	1968	220	Good
County Road 103 over Hanging Woman Creek 056	1986	203	Fair
County Road 103 over Tongue River 054	1976	203	Fair
Irr Bia Rte 73 over Big Horn Canal	1986	200	Good
Irr Bia Rte 73 over Rotten Grass Creek	1980	200	Fair
Irr Bia Rte 73 over Rotten Grass Creek	1980	200	Fair
Irr Bia Rte 73 over Rotten Grass Creek	1986	200	Fair
Little Horn Rd over Little Bighorn River 072	1952	183	Fair
Little Horn Rd over Little Bighorn River 073	1996	183	Good
Little Horn Rd over Pass Creek 071	2004	183	Good
Battlefield Road over Deep Coulee	1938	150	Fair
Battlefield Road over Medicine Tail Coulee	1938	150	Poor
Pass Creek Rd over Pass Creek 021	1979	109	Fair
Back Loop Rd over Little Bighorn River 023	1986	100	Good
Bala St over Little Bighorn River 069	1958	100	Fair
Black Bridge Rd over Little Bighorn River 024	1998	100	Good
Corporation Rd over Two Leggin`s Creek 035	1991	100	Fair
County Road 143 over Unnamed Creek 059	1950	100	Fair
Fly Creek Rd over Int Ballantine-i 90 003	1972	100	Fair
Forty Mile Rd over Owl Creek 085	2015	100	Fair
IRRC0UNTY Road 223 over Soap Creek 020	1980	100	Fair
Irr - Frontage 315 over Little Bighorn River 002	1976	100	Fair
Irr - Frontage 325 over Little Bighorn River 075	1976	100	Fair
Irr Bia Rte 209 over Rosebud Creek	2019	100	Good
Irr Bia Rte 8 over Pryor Creek	1997	100	Good
N Torske Overpass over Sep I 90 00	1971	100	Good
Peritsa Creek Rd over Two Leggin`s Canal 048	2014	100	Good
Pine Ridge Rd over Two Leggin`s Canal 014	1993	100	Fair
Rail Rd over Two Leggins Canal	2021	100	Good
Ranch Access Op over Sep I-90 001	1985	100	Good
Randall Road over Two Leggins Canal	2024	100	Good
Sarpy Basin Rd over E Fork Sarpy Creek 028	1971	100	Fair
Sarpy Basin Rd over Sarpy Creek 033	1981	100	Fair
Upper Rd over Two Leggin`s Canal 005	1950	100	Fair
W Boehs Rd over Two Leggin`s Canal 049	1996	100	Fair
Warman Loop over Bighorn Canal 018	1930	100	Fair
Irr Bia Rte 205 over Little Big Horn River	1993	80	Fair
Irr Bia Rte 210 over West Fork Muddy Creek	1977	80	Good
Soap Creek Rd over Big Horn Canal 009	1946	63	Poor
Irr Bia Rte 24 over Rosebud Creek	2019	60	Fair
Hwy 463 over Rotten Grass Creek 008	1966	49	Good
Frontage Road 332 over Lodge Grass Creek 070	2015	45	Good
Tullock CR Rd over Tullock Creek 029	2006	34	Fair
Tullock CR Rd over Tullock Creek 030	1985	34	Good
Vanzandt Rd over Two Leggin`s Canal 047	1994	29	Good
Irr Bia Rte 205 over Upper Lodge Grass Creek	1994	12	Poor
Irr Bia Rte 228 over Rosebud Creek	1983	10	Fair
Irr Bia Rte 226 over Black Canyon Creek	1965	5	Poor

Source: FHWA National Bridge Inventory, 2025.

Big Horn County bridge conditions · Montana bridges by county.

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