Rosebud County, MT

114 public highway bridges

Rosebud County Bridge Snapshot

Rosebud County, Montana contains 114 public highway bridges in the FHWA National Bridge Inventory. Roughly 17.5% are rated “Good,” 59.6% “Fair,” 5.3% “Poor,” and 5.3% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in MT are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

114

Total Bridges

17.5%

Good

5.3%

Poor

5.3%

Structurally Deficient

Condition Distribution

Good

17.5% (20)

Fair

59.6% (68)

Poor

5.3% (6)

SD

5.3% (6)

All Bridges (114)

Sort:

OLD HWY 10

Over: SWEENEY CREEK 064

7M E ROSEBUD, Rosebud, MT

Built 1930 Load: 24.5 t ADT: 127

US 12

Over: DRAINAGE

3M E SUMATRA, Rosebud, MT

Built 1947 Load: 24.5 t ADT: 144

S 566-TONGUE R RD

Over: HANGING WOMAN CREEK

SW BIRNEY, Rosebud, MT

Built 1975 Load: 24.5 t ADT: 44

US 12

Over: DRAINAGE

32M NW FORSYTH, Rosebud, MT

Built 1941 Load: 25.4 t ADT: 144

IRR - L44235

Over: ARMELLS CREEK

22M NW COLSTRIP, Rosebud, MT

Built 1967 Load: 25.4 t ADT: 100

S 447

Over: ROSEBUD CREEK

7M SW ROSEBUD, Rosebud, MT

Built 1971 Load: 25.4 t ADT: 126

S 447

Over: ROSEBUD CREEK OVERFLOW

7M SW ROSEBUD, Rosebud, MT

Built 1971 Load: 25.4 t ADT: 126

I 94

Over: ROSEBUD CREEK

1M W ROSEBUD, Rosebud, MT

Built 1970 Load: 26.3 t ADT: 2,602

FRONTAGE ROAD 020

Over: RESERVATION CREEK 036

12M W FORSYTH, Rosebud, MT

Built 1928 Load: 26.3 t ADT: 25

OLD HWY 10 E

Over: ARMELLS CREEK 045

5M W FORSYTH, Rosebud, MT

Built 1932 Load: 26.3 t ADT: 350

IRR - S 39

Over: EAST FORK ARMELLS CREEK

16M NW COLSTRIP, Rosebud, MT

Built 1983 Load: 26.3 t ADT: 782

I 94

Over: ROSEBUD CREEK

1M W ROSEBUD, Rosebud, MT

Built 1970 Load: 27.2 t ADT: 2,602

I 94

Over: GRAVEYARD CREEK

1M E HATHAWAY, Rosebud, MT

Built 1977 Load: 27.2 t ADT: 2,602

ROSEBUD CREEK RD

Over: ROSEBUD CR OVRFLOW 046

10M SE COLSTRIP, Rosebud, MT

Built 1980 Load: 27.2 t ADT: 38

OLD HWY 10 E

Over: DRAINAGE 052

3M W FORSYTH, Rosebud, MT

Built 1941 Load: 27.2 t ADT: 350

HAMMOND VALLEY RD

Over: GREASEWOOD CREEK 033

7M NW FORSYTH, Rosebud, MT

Built 1979 Load: 28.1 t ADT: 65

IRR - S 39

Over: RR-POWER PLANT ROAD

SOUTH EDGE COLSTRIP, Rosebud, MT

Built 1981 Load: 28.1 t ADT: 1,243

INGOMAR RD

Over: W FK FROZE TO DEATH 006

5M S INGOMAR, Rosebud, MT

Built 1979 Load: 29.0 t ADT: 100

CARTERSVILLE RD

Over: LITTLE PORCUPINE CR 027

8M NE FORSYTH, Rosebud, MT

Built 1970 Load: 29.0 t ADT: 100

US 12

Over: DRAINAGE

35M NW FORSYTH, Rosebud, MT

Built 1941 Load: 29.0 t ADT: 144

US 12

Over: DRAINAGE

32M NW FORSYTH, Rosebud, MT

Built 1941 Load: 29.0 t ADT: 144

HAMMOND VALLEY RD

Over: BIG PORCUPINE CR 034

8M NW FORSYTH, Rosebud, MT

Built 1977 Load: 29.9 t ADT: 65

IRR - S 39

Over: ROSEBUD CREEK

9M SE COLSTRIP, Rosebud, MT

Built 2004 Load: 29.9 t ADT: 713

S 332

Over: TONGUE RIVER

20M N ASHLAND, Rosebud, MT

Built 1963 Load: 29.9 t ADT: 64

S 566-TONGUE R RD

Over: CANYON CREEK

11M SW BIRNEY, Rosebud, MT

Built 1990 Load: 29.9 t ADT: 44

LIL PORCUPINE CR R

Over: LITTLE PORCUPINE CR 014

11M N FORSYTH, Rosebud, MT

Built 1978 Load: 30.8 t ADT: 223

S 59

Over: DRY HOUSE CREEK

25 M NW MILES CITY, Rosebud, MT

Built 2007 Load: 31.8 t ADT: 1,250

BIG PORCUPINE RD

Over: BIG PORCUPINE CR 010

5M NE VANANDA, Rosebud, MT

Built 1992 Load: 32.7 t ADT: 100

OLD US 10

Over: BUTTE CREEK 041

E ROSEBUD, Rosebud, MT

Built 2015 Load: 32.7 t ADT: 127

POWER RD

Over: RR 076

N EDGE COLSTRIP, Rosebud, MT

Built 1982 Load: 32.7 t ADT: 942

S 332

Over: DRAINAGE

11M N ASHLAND, Rosebud, MT

Built 1986 Load: 32.7 t ADT: 29

IRR

Over: TONGUE RIVER

ASHLAND, Rosebud, MT

Built 1970 Load: 32.7 t ADT: 1,083

CARTERSVILLE RD

Over: SAND CREEK 042

8M NE ROSEBUD, Rosebud, MT

Built 2012 Load: 33.6 t ADT: 138

S 566-TONGUE R RD

Over: TONGUE RIVER

31M SW ASHLAND, Rosebud, MT

Built 1980 Load: 34.5 t ADT: 44

US 212

Over: OTTER CREEK

EAST EDGE ASHLAND, Rosebud, MT

Built 2013 Load: 36.3 t ADT: 2,211

OLD HWY 10

Over: ROSEBUD CREEK

2M W ROSEBUD, Rosebud, MT

Built 2005 Load: 38.1 t ADT: 374

I 94

Over: GRAVEYARD CREEK

1M E HATHAWAY, Rosebud, MT

Built 1962 Load: 58.1 t ADT: 2,602

IRR - S 39

Over: SHEEP CREEK

16M NW COLSTRIP, Rosebud, MT

Built 1982 Load: 76.2 t ADT: 782

US 12

Over: BIG PORCUPINE CREEK

13M NW FORSYTH, Rosebud, MT

Built 2004 Load: 20.0 t ADT: 226

BIG PORCUPINE RD

Over: BIG PORCUPINE CREEK 011

8M N VANANDA, Rosebud, MT

Built 2006 Load: 21.4 t ADT: 12

US HWY 12

Over: MUSSELSHELL RIVER

2M NE MELSTONE, Rosebud, MT

Built 2019 Load: 21.8 t ADT: 240

I 94

Over: ARMELLS CR-RR

6M W FORSYTH, Rosebud, MT

Built 1967 Load: 22.7 t ADT: 2,138

ACORN FLATS RD

Over: BIG PORCUPINE CR 005

13M NE INGOMAR, Rosebud, MT

Built 2007 Load: 25.4 t ADT: 100

US 12

Over: EAST SPRING COULEE

11M NW FORSYTH, Rosebud, MT

Built 2012 Load: 26.3 t ADT: 226

US 12

Over: DRAINAGE

9M NW FORSYTH, Rosebud, MT

Built 2012 Load: 26.3 t ADT: 226

US 12

Over: DRAINAGE

8M NW FORSYTH, Rosebud, MT

Built 2012 Load: 28.1 t ADT: 226

US 12

Over: DRAINAGE

8M NW FORSYTH, Rosebud, MT

Built 2012 Load: 29.9 t ADT: 226

PETROLEUM RD

Over: BIG PORCUPINE CR

14M E INGOMAR, Rosebud, MT

Built 2022 Load: 31.8 t ADT: 100

US 12

Over: GREASEWOOD CREEK

7M NW FORSYTH, Rosebud, MT

Built 2012 Load: 31.8 t ADT: 226

IRR BIA RTE 4

Over: BIRNEY CREEK

2.9 KM NW OF BIRNEY, Rosebud, MT

Built 2007 Load: 32.7 t ADT: 250

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026