Total bridges
37
Public highway bridges in Fallon County
County profile · official public datasets
Fallon County, MT
37 public highway bridges tracked in the FHWA National Bridge Inventory: 45.9% rated Good, 51.4% Fair, 2.7% Poor.
- 37
- Public bridges
- 45.9%
- Good condition
- 2.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Fallon County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 16%
- lowest Poor share in state
- 2.7%
- Poor-condition share
- 37
- public highway bridges
- 1998
- 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.
Fallon County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Fallon County ranks #9 of 56 Montana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.7%). Fallon County, Montana contains 37 public highway bridges. Roughly 45.9% are rated “Good,” 51.4% “Fair,” and 2.7% “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
45.9%
17 of 37 rated 7-9
Fair condition
51.4%
19 of 37 rated 5-6
Poor condition
2.7%
1 of 37 rated 4 or below
In-state Poor-share rank
#9 of 56
Among Montana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 37 NBI-tracked bridges by lowest applicable component rating.
Good 45.9% (17)
Fair 51.4% (19)
Poor 2.7% (1)
Fallon County's Poor-condition bridges carry 30 vehicle crossings a day
That is 0.3% of the county's reported daily bridge traffic on 2.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 30 crossings a day against 209 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 37 of 37 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
18.9% of Fallon County's bridges have passed the 50-year mark
7 of the 37 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 45.9% 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 100% of the county's Poor-condition bridge traffic
CABIN CREEK LOOP over CABIN CREEK 057, built 1980, carries 30 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 1-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 30 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Fallon County's bridges were built
37 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1940s 1
1940–1949
1 bridges
- 1960s 3
1960–1969
3 bridges
- 1970s 3
1970–1979
3 bridges
- 1980s 1
1980–1989
1 bridges
- 1990s
1990–1999
6 bridges
- 2000s
2000–2009
6 bridges
- 2010s
2010–2019
13 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 2010s, when 13 of the county's bridges still in the inventory were built, which is 35.1% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1998, 21 years newer than the Montana average of 1977.
How Fallon County compares with Montana's closest counties by inventory size
The 5 Montana counties nearest Fallon County in number of bridges, with their condition splits. Its 2.7% Poor share is the 2nd-lowest of these 6. Its average build year of 1998 against a peer-group mean of 1982 is 16 years newer.
Showing the 5 closest of 55 Montana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Chouteau County | 42 | 54.8% | 38.1% | 7.1% | 1981 |
| Carter County | 41 | 31.7% | 63.4% | 4.9% | 1985 |
| Broadwater County | 37 | 27% | 67.6% | 5.4% | 1990 |
| Fallon County (this page) | 37 | 45.9% | 51.4% | 2.7% | 1998 |
| Toole County | 35 | 34.3% | 65.7% | 0% | 1973 |
| Daniels County | 33 | 51.5% | 39.4% | 9.1% | 1982 |
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 Fallon 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 Fallon County, both outside Montana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MT (37 bridges here).
- Sitka City and County, AK · 37 bridges
- Suwannee County, FL · 37 bridges
- Teton County, ID · 37 bridges
- Dickinson County, MI · 37 bridges
Similar average build year
Nearest mean year-built outside MT (1998 here).
- Collin County, TX · avg 1998 · 1,127 bridges
- Orange County, FL · avg 1998 · 885 bridges
- Fort Bend County, TX · avg 1998 · 795 bridges
- Montgomery County, TX · avg 1998 · 710 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (37)
US 12
FairOver: RR
2M SE BAKER, Fallon, MT
Built 1968 Load: 20.9 t ADT: 671
US 12
FairOver: SANDSTONE CREEK
2M W PLEVNA, Fallon, MT
Built 1971 Load: 25.4 t ADT: 495
US 12
FairOver: HAY CREEK
9M W PLEVNA, Fallon, MT
Built 1932 Load: 27.2 t ADT: 513
PLEVNA RD S
FairOver: SOUTH FORK SANDSTONE CR
1M S PLEVNA, Fallon, MT
Built 1964 Load: 27.2 t ADT: 76
SNAKE TRAIL
FairOver: DRAINAGE 054
19M NE BAKER, Fallon, MT
Built 2003 Load: 27.9 t ADT: 100
COUNTY ROAD 054
FairOver: SANDSTONE CREEK 034
5M E PLEVNA, Fallon, MT
Built 2005 Load: 28.1 t ADT: 7
MAIN ST S
FairOver: SANDSTONE CREEK
SOUTH PLEVNA, Fallon, MT
Built 1964 Load: 29.0 t ADT: 118
US 12
FairOver: O`FALLON CREEK
11M W PLEVNA, Fallon, MT
Built 1971 Load: 29.9 t ADT: 513
S 322
FairOver: LITTLE BEAVER CREEK
16M S BAKER, Fallon, MT
Built 1992 Load: 31.8 t ADT: 42
S 7-MAIN ST N
FairOver: SANDSTONE CREEK
NORTH EDGE BAKER, Fallon, MT
Built 1941 Load: 32.7 t ADT: 2,196
US 12
FairOver: TIMBER CREEK
5M W BAKER, Fallon, MT
Built 1998 Load: 35.4 t ADT: 820
COUNTY ROAD 154
FairOver: LITTLE BEAVER CREEK 015
8M SW WEBSTER, Fallon, MT
Built 2014 Load: 36.3 t ADT: 100
SUNNY BANK RD
FairOver: S FK SANDSTONE CREEK 044
9M SE PLEVNA, Fallon, MT
Built 2013 Load: 37.2 t ADT: 100
CABIN CR RD
FairOver: CABIN CREEK 053
24M NW BAKER, Fallon, MT
Built 2012 Load: 37.2 t ADT: 100
US 12
FairOver: DRAINAGE
WEST EDGE BAKER, Fallon, MT
Built 1998 Load: 39.0 t ADT: 1,590
COUNTY ROAD 137
FairOver: S FK SANDSTONE CREEK 025
1M SW PLEVNA, Fallon, MT
Built 2011 Load: 42.6 t ADT: 100
WESTMORE RD
FairOver: SANDSTONE CREEK 024
11M NW PLEVNA, Fallon, MT
Built 2016 Load: 42.6 t ADT: 20
US 12
FairOver: SANDSTONE CREEK
EAST EDGE PLEVNA, Fallon, MT
Built 1998 Load: 50.8 t ADT: 749
WILLARD RD W
FairOver: O`FALLON CREEK 005
31M SW PLEVNA, Fallon, MT
Built 1995 Load: 99.9 t ADT: 100
ISMAY RD
GoodOver: COTTONWOOD CREEK
3.9M S ISMAY, Fallon, MT
Built 2023 ADT: 38
BONNIEVALE RD
GoodOver: SANDSTONE CREEK
N BAKER, Fallon, MT
Built 2023 ADT: 100
ASH CR RD E
GoodOver: E FORK BEAVER CREEK 055
21M NE BAKER, Fallon, MT
Built 2003 Load: 25.4 t ADT: 100
WESTMORE RD
GoodOver: PENNEL CREEK 022
16M NW PLEVNA, Fallon, MT
Built 1991 Load: 27.2 t ADT: 20
COUNTY ROAD 178
GoodOver: LITTLE BEAVER CREEK 055
12M NE WEBSTER, Fallon, MT
Built 2013 Load: 31.8 t ADT: 100
WEBSTER RD
GoodOver: LITTLE BEAVER CREEK
18M NE EKALAKA, Fallon, MT
Built 1978 Load: 31.8 t ADT: 26
ANTICLINE RD
GoodOver: PENNEL CREEK 013
8M NW BAKER, Fallon, MT
Built 2009 Load: 32.7 t ADT: 30
ASH CR RD E
GoodOver: BEAVER CREEK 031
21M NE BAKER, Fallon, MT
Built 2003 Load: 33.2 t ADT: 100
S 336-OLLIE RD
GoodOver: FORK OF BEAVER CREEK
20M NE BAKER, Fallon, MT
Built 2016 Load: 33.7 t ADT: 31
LAKE ST
GoodOver: BAKER LAKE OVERFLOW
BAKER-LAKE ST, Fallon, MT
Built 2009 Load: 37.2 t ADT: 2,379
S 336-OLLIE RD
GoodOver: BEAVER CREEK
21M NE BAKER, Fallon, MT
Built 2016 Load: 39.0 t ADT: 28
PRAIRIE VIEW DR
GoodOver: SANDSTONE CREEK 059
W EDGE BAKER, Fallon, MT
Built 2012 Load: 48.1 t ADT: 100
COUNTY ROAD 141
GoodOver: S FK SANDSTONE CREEK 048
8M SE PLEVNA, Fallon, MT
Built 2012 Load: 49.0 t ADT: 100
DRY FORK RD
GoodOver: PENNEL CREEK 023
9M NW PLEVNA, Fallon, MT
Built 2016 Load: 51.7 t ADT: 100
AG LANE
GoodOver: SANDSTONE CREEK 056
1M W BAKER, Fallon, MT
Built 2014 Load: 54.4 t ADT: 100
PLEVNA RD N
GoodOver: PENNEL CREEK
6 M N PLEVNA, Fallon, MT
Built 2020 Load: 61.7 t ADT: 107
WEBSTER RD
GoodOver: N FK COAL BANK CREEK 004
14M SE WEBSTER, Fallon, MT
Built 2017 Load: 78.0 t ADT: 100
CABIN CREEK LOOP
PoorOver: CABIN CREEK 057
22M N PLEVNA, Fallon, MT
Built 1980 Load: 99.9 t ADT: 30
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.