Total bridges
57
Public highway bridges in Roosevelt County
County profile · official public datasets
Roosevelt County, MT
57 public highway bridges tracked in the FHWA National Bridge Inventory: 28.1% rated Good, 64.9% Fair, 7% Poor.
- 57
- Public bridges
- 28.1%
- Good condition
- 7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Roosevelt County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- 35th
- of 56 on Poor share
- 7%
- Poor-condition share
- 57
- public highway bridges
- 1984
- avg year built
Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.
Roosevelt County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Roosevelt County ranks #35 of 56 Montana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7%). Roosevelt County, Montana contains 57 public highway bridges. Roughly 28.1% are rated “Good,” 64.9% “Fair,” and 7% “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.
Good condition
28.1%
16 of 57 rated 7-9
Fair condition
64.9%
37 of 57 rated 5-6
Poor condition
7%
4 of 57 rated 4 or below
In-state Poor-share rank
#35 of 56
Among Montana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 57 NBI-tracked bridges by lowest applicable component rating.
Good 28.1% (16)
Fair 64.9% (37)
Poor 7% (4)
Roosevelt County's Poor-condition bridges carry 4,604 vehicle crossings a day
That is 10.3% of the county's reported daily bridge traffic on 7% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,151 crossings a day against 375 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.
Computed over the 57 of 57 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
38.6% of Roosevelt County's bridges have passed the 50-year mark
22 of the 57 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 28.1% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.
Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.
One structure carries 51.2% of the county's Poor-condition bridge traffic
IRR - US 2 over CHELSEA CREEK, built 1960, carries 2,359 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 4-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 4,604 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Roosevelt County's bridges were built
57 bridges with a recorded construction year, grouped by decade
- 1930s 3
1930–1939
3 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s
1950–1959
11 bridges
- 1960s 4
1960–1969
4 bridges
- 1970s
1970–1979
6 bridges
- 1980s
1980–1989
5 bridges
- 1990s
1990–1999
8 bridges
- 2000s
2000–2009
7 bridges
- 2010s
2010–2019
6 bridges
- 2020s
2020–2029
6 bridges
What this shows Construction peaked in the 1950s, when 11 of the county's bridges still in the inventory were built, which is 19.3% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1984, 7 years newer than the Montana average of 1977.
How Roosevelt County compares with Montana's closest counties by inventory size
The 5 Montana counties nearest Roosevelt County in number of bridges, with their condition splits. Its 7% Poor share is the 4th-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1977 is 7 years newer.
Showing the 5 closest of 55 Montana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Deer Lodge County | 68 | 27.9% | 66.2% | 5.9% | 1973 |
| Silver Bow County | 68 | 16.2% | 82.4% | 1.5% | 1974 |
| Sheridan County | 66 | 16.7% | 80.3% | 3% | 1979 |
| Roosevelt County (this page) | 57 | 28.1% | 64.9% | 7% | 1984 |
| Meagher County | 53 | 20.8% | 69.8% | 9.4% | 1980 |
| Judith Basin County | 48 | 56.3% | 31.3% | 12.5% | 1979 |
Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Roosevelt County's. Source: FHWA National Bridge Inventory, 2024 release.
Nationwide counties with similar inventory size or average build year
Two NBI-derived peer sets for Roosevelt County, both outside Montana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MT (57 bridges here).
- Summit County, CO · 57 bridges
- DeSoto County, FL · 57 bridges
- Dodge County, GA · 57 bridges
- McIntosh County, GA · 57 bridges
Similar average build year
Nearest mean year-built outside MT (1984 here).
- Hennepin County, MN · avg 1984 · 936 bridges
- Duval County, FL · avg 1984 · 831 bridges
- El Paso County, CO · avg 1984 · 686 bridges
- Bell County, TX · avg 1984 · 660 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (16)
RD 2051
GoodOver: EAST SHOTGUN CREEK 057
9 M N BAINVILLE, Roosevelt, MT
Built 2023 ADT: 100
IRR - S 251
GoodOver: Drainage
25 North East of Popular, Roosevelt, MT
Built 2023 ADT: 87
S 16
GoodOver: SHEEP CREEK
SOUTH EDGE FROID, Roosevelt, MT
Built 1970 Load: 28.1 t ADT: 879
IRR BIA RTE 34
GoodOver: BOX ELDER CREEK
2.1 KM WEST OF POPLAR, Roosevelt, MT
Built 1997 Load: 30.3 t ADT: 250
S 327
GoodOver: DRAINAGE
14M SE BAINVILLE, Roosevelt, MT
Built 1999 Load: 31.8 t ADT: 273
COUNTY ROAD 249
GoodOver: SHEEP CREEK 061
4M NW FROID, Roosevelt, MT
Built 1999 Load: 32.7 t ADT: 100
THREE CORNERS RD
GoodOver: SMOKE CREEK 024
30M N POPLAR, Roosevelt, MT
Built 2016 Load: 32.7 t ADT: 100
IRR - S 13
GoodOver: BOX ELDER CREEK
23M NE WOLF POINT, Roosevelt, MT
Built 2019 Load: 33.6 t ADT: 179
NEW ALIGNMENT BUIL
GoodOver: DRAINAGE
3M EAST BAINVILLE, Roosevelt, MT
Built 2020 Load: 39.0 t ADT: 280
US 2
GoodOver: RED BANK CREEK
4M E BAINVILLE, Roosevelt, MT
Built 2010 Load: 39.9 t ADT: 1,440
IRR BIA RTE 40
GoodOver: POPLAR RIVER
10 KM N OF PRYOR, Roosevelt, MT
Built 2000 Load: 40.8 t ADT: 200
S 327
GoodOver: LITTLE MUDDY CREEK
3M SE BAINVILLE, Roosevelt, MT
Built 2020 Load: 42.6 t ADT: 280
S 327
GoodOver: LITTLE MUDDY CREEK
3M SE BAINVILLE, Roosevelt, MT
Built 2020 Load: 46.3 t ADT: 280
ROAD 1077
GoodOver: COTTONWOOD CREEK 018
30M N WOLF POINT, Roosevelt, MT
Built 1995 Load: 70.8 t ADT: 100
IRR - US 2
GoodOver: DRAINAGE
2M W BROCKTON, Roosevelt, MT
Built 1970 Load: 99.9 t ADT: 1,362
IRR - S 251
GoodOver: KIRN COULEE
22M NE POPLAR, Roosevelt, MT
Built 2008 Load: 99.9 t ADT: 87
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges 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. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.