Sweet Grass County, MT
89 public highway bridges
Sweet Grass County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Sweet Grass County, Montana contains 89 public highway bridges. Roughly 21.3% are rated “Good,” 49.4% “Fair,” and 5.6% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Condition Distribution
All Bridges (89)
BOULDER RD
FairOver: MILLER CREEK 001
19M S MCLEOD, Sweet Grass, MT
BRIDGER CREEK RD
FairOver: BRIDGER CREEK 054
15M S GREYCLIFF, Sweet Grass, MT
OLD US 10
FairOver: SPRING CREEK 035
2M NW GREYCLIFF, Sweet Grass, MT
I 90
FairOver: LOWER DEER CREEK
0.6M W GREYCLIFF, Sweet Grass, MT
I 90
FairOver: WORK CREEK
3.7M W REED POINT, Sweet Grass, MT
OLD US 10
FairOver: DRY CREEK 004
6M NW GREYCLIFF, Sweet Grass, MT
BOULDER RD
FairOver: SPECULATOR CREEK 011
20M S MCLEOD, Sweet Grass, MT
US 191
FairOver: OTTER CREEK
4M S MELVILLE, Sweet Grass, MT
OTTER CREEK RD
FairOver: TEN MILE CREEK 009
11M SE MELVILLE, Sweet Grass, MT
SUSIE CREEK RD
FairOver: BOULDER RIVER 045
1M S MCLEOD, Sweet Grass, MT
US 191
FairOver: BIG TIMBER CREEK
2M N BIG TIMBER, Sweet Grass, MT
I 90
FairOver: UPPER DEER CREEK
2.5M W GREYCLIFF, Sweet Grass, MT
I 90
FairOver: UPPER DEER CREEK
2.5M W GREYCLIFF, Sweet Grass, MT
HOWIE RD
FairOver: DRAINAGE 021
3M NE BIG TIMBER, Sweet Grass, MT
I 90
FairOver: SPRING CREEK
1M NW GREYCLIFF, Sweet Grass, MT
DRY FORK ROAD
GoodOver: E. BOULDER RIVER
NO DATA ENTERED, Sweet Grass, MT
OLD US 10
GoodOver: UPPER DEER CREEK 005
4M NW GREYCLIFF, Sweet Grass, MT
I 90
GoodOver: CNTY RD 113-FRYER CREEK
4.3M E SPRINGDALE, Sweet Grass, MT
NO DATA ENTERED
GoodOver: PICKET PIN CREEK
NO DATA ENTERED, Sweet Grass, MT
SOURDOUGH RD
GoodOver: SWEET GRASS CREEK 027
13M NE BIG TIMBER, Sweet Grass, MT
LOWER SWEET GRASS
GoodOver: SWEET GRASS CREEK 039
10M E BIG TIMBER, Sweet Grass, MT
LOWER SWEET GRASS
GoodOver: E FK SWEET GRASS CR 01
14M NE BIG TIMBER, Sweet Grass, MT
MELVILLE ROAD
GoodOver: SWEET GRASS CREEK
11 M NW MELVILLE, Sweet Grass, MT
OLD BOULDER ROAD
GoodOver: BOULDER RIVER 029
EAST BIG TIMBER, Sweet Grass, MT
I 90
GoodOver: LOWER DEER CREEK
0.6M W GREYCLIFF, Sweet Grass, MT
E BOULDER RD
GoodOver: BOULDER RIVER 030
2M S MCLEOD, Sweet Grass, MT
BRIDGER CREEK ROAD
GoodOver: BRIDGER CREEK
9M SE GREYCLIFF, Sweet Grass, MT
HOWIE RD
GoodOver: OTTER CREEK
2M NE BIG TIMBER, Sweet Grass, MT
BRIDGER CREEK RD
GoodOver: BRIDGER CREEK
13.6M SE GREYCLIFF, Sweet Grass, MT
OTTER CREEK RD
GoodOver: SWEET GRASS CREEK 00
6M SE MELVILLE, Sweet Grass, MT
SWAMP CREEK RD
GoodOver: BIG TIMBER CREEK
4M N BIG TIMBER, Sweet Grass, MT
RAPELJE RD
GoodOver: SWEET GRASS CREEK
11M NE BIG TIMBER, Sweet Grass, MT
SWAMP CREEK RD
GoodOver: SWAMP CREEK
5.9M N BIG TIMBER, Sweet Grass, MT
DERBY GULCH ROAD
GoodOver: WEST BRIDGER CREEK
NO DATA ENTERED, Sweet Grass, MT
UPPER DEER CR RD
PoorOver: UPPER DEER CREEK 028
6M SE BIG TIMBER, Sweet Grass, MT
MCLEOD MAIN ST
PoorOver: WEST BOULDER RIVER 025
MCLEOD, Sweet Grass, MT
BOINTER RD
PoorOver: SWEET GRASS CREEK 044
9M SE BIG TIMBER, Sweet Grass, MT
S 91
PoorOver: BOULDER RIVER OVERFLOW
BIG TIMBER, Sweet Grass, MT
US 191
PoorOver: RYE CREEK
2M S MELVILLE, Sweet Grass, MT
Read our methodology - how this data is sourced, computed, and verified.
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Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.