Total bridges
124
Public highway bridges in Park County
County profile · official public datasets
Park County, MT
124 public highway bridges tracked in the FHWA National Bridge Inventory: 21% rated Good, 68.5% Fair, 10.5% Poor.
- 124
- Public bridges
- 21%
- Good condition
- 10.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Park County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 46th
- of 56 on Poor share
- 10.5%
- Poor-condition share
- 124
- public highway bridges
- 1976
- 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.
Park County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Park County ranks #46 of 56 Montana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 10.5%). Park County, Montana contains 124 public highway bridges. Roughly 21% are rated “Good,” 68.5% “Fair,” and 10.5% “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
21%
26 of 124 rated 7-9
Fair condition
68.5%
85 of 124 rated 5-6
Poor condition
10.5%
13 of 124 rated 4 or below
In-state Poor-share rank
#46 of 56
Among Montana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 124 NBI-tracked bridges by lowest applicable component rating.
Good 21% (26)
Fair 68.5% (85)
Poor 10.5% (13)
Park County's Poor-condition bridges carry 3,915 vehicle crossings a day
That is 1.9% of the county's reported daily bridge traffic on 10.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 301 crossings a day against 772 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 124 of 124 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
47.6% of Park County's bridges have passed the 50-year mark
59 of the 124 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 21% 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 72.8% of the county's Poor-condition bridge traffic
US 89 over INT EAST LIVINGSTON I 90, built 1962, carries 2,850 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 13-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 3,915 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Park County's bridges were built
124 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1910s 2
1910–1919
2 bridges
- 1920s 4
1920–1929
4 bridges
- 1930s
1930–1939
9 bridges
- 1940s 3
1940–1949
3 bridges
- 1950s
1950–1959
12 bridges
- 1960s
1960–1969
16 bridges
- 1970s
1970–1979
21 bridges
- 1980s
1980–1989
22 bridges
- 1990s 4
1990–1999
4 bridges
- 2000s
2000–2009
13 bridges
- 2010s
2010–2019
12 bridges
- 2020s 5
2020–2029
5 bridges
What this shows Construction peaked in the 1980s, when 22 of the county's bridges still in the inventory were built, which is 17.7% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1976) matches the Montana average (1977).
How Park County compares with Montana's closest counties by inventory size
The 5 Montana counties nearest Park County in number of bridges, with their condition splits. Its 10.5% Poor share is the 5th-lowest of these 6. Its average build year of 1976 against a peer-group mean of 1980 is in line with the group.
Showing the 5 closest of 55 Montana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Big Horn County | 135 | 26.7% | 68.1% | 5.2% | 1978 |
| Jefferson County | 134 | 17.9% | 76.9% | 5.2% | 1977 |
| Park County (this page) | 124 | 21% | 68.5% | 10.5% | 1976 |
| Sanders County | 120 | 40% | 52.5% | 7.5% | 1979 |
| Lake County | 117 | 57.3% | 27.4% | 15.4% | 1995 |
| Rosebud County | 114 | 18.4% | 76.3% | 5.3% | 1973 |
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 Park 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 Park County, both outside Montana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MT (124 bridges here).
- Bannock County, ID · 124 bridges
- Breathitt County, KY · 124 bridges
- Caldwell County, LA · 124 bridges
- St. Mary County, LA · 124 bridges
Similar average build year
Nearest mean year-built outside MT (1976 here).
- Marion County, IN · avg 1976 · 958 bridges
- Mohave County, AZ · avg 1976 · 641 bridges
- Comanche County, OK · avg 1976 · 593 bridges
- Prince George's County, MD · avg 1976 · 576 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (124)
COUNTY ROAD 280
GoodOver: SODA BUTTE CREEK
SILVER GATE, Park, MT
Built 2022 Load: 30.1 t ADT: 100
BANNOCK TRAIL
GoodOver: WYOMING CREEK
1M E SILVER GATE, Park, MT
Built 2022 Load: 30.5 t ADT: 100
I 90
GoodOver: MISSION CREEK-INT RAMP
9.9M E LIVINGSTON, Park, MT
Built 1987 Load: 30.8 t ADT: 53
ROCK CREEK RD N
GoodOver: ROCK CREEK 029
9M E CLYDE PARK, Park, MT
Built 2015 Load: 32.7 t ADT: 100
FRONTAGE RD E 448
GoodOver: MISSION CREEK 002
8M NE LIVINGSTON, Park, MT
Built 1987 Load: 32.7 t ADT: 99
S YELLOWSTONE ST
GoodOver: FLESHMAN CREEK 071
LIVINGSTON-SACAGAWEA PARK, Park, MT
Built 1939 Load: 32.7 t ADT: 100
CONVICT GRADE RD
GoodOver: SHEILDS RIVER
6M NE OF LIVINGSTON, Park, MT
Built 2019 Load: 35.4 t ADT: 100
SODA CR TR-REPUBLI
GoodOver: WOODY CREEK
COOKE CITY, Park, MT
Built 2022 Load: 35.6 t ADT: 100
MURPHY LN
GoodOver: IRRIGATION CANAL 003
E EMIGRANT, Park, MT
Built 2003 Load: 36.3 t ADT: 1,444
S 540-E RIVER RD
GoodOver: SIX MILE CREEK
6M SW PRAY, Park, MT
Built 2006 Load: 39.9 t ADT: 257
OLD YELLOWSTONE TR
GoodOver: ROCK CREEK
18 M NW GARDINER, Park, MT
Built 2018 Load: 53.5 t ADT: 100
MAIN BOULDER ROAD
PoorOver: BOULDER RIVER
38 M SOUTH OF SPRINGDALE, Park, MT
Built 1950 ADT: 156
SWINGLEY RD
PoorOver: W BOULDER RIVER 038
18M E LIVINGSTON, Park, MT
Built 1938 Load: 4.5 t ADT: 52
POTTER CREEK RD
PoorOver: POTTER CREEK 005
1M N WILSALL, Park, MT
Built 1915 Load: 9.1 t ADT: 100
HAMMOND CREEK RD
PoorOver: ROCK CREEK 025
5M E CLYDE PARK, Park, MT
Built 1967 Load: 10.9 t ADT: 100
ELK CREEK RD
PoorOver: SHIELDS RIVER 018
3M NE WILSALL, Park, MT
Built 1960 Load: 12.7 t ADT: 100
SHIELDS RIVER RD E
PoorOver: SHIELDS RIVER 023
8M NE LIVINGSTON, Park, MT
Built 1923 Load: 14.5 t ADT: 100
STATION ROAD
PoorOver: BOULDER RIVER
BOX CANYON ADMIN SITE, Park, MT
Built 1947 Load: 15.6 t ADT: 1
SHIELDS RIVER RD E
PoorOver: SHIELDS RIVER OVERFL 022
8M NE LIVINGSTON, Park, MT
Built 1938 Load: 20.0 t ADT: 100
TEMPLED HILLS RD.
PoorOver: MILL CREEK
S. OF LIVINGSTON, Park, MT
Built 1952 Load: 20.7 t ADT: 50
BIG CREEK ROAD
PoorOver: BIG CREEK
S. OF LIVINGSTON, Park, MT
Built 1961 Load: 21.7 t ADT: 50
US 89
PoorOver: INT EAST LIVINGSTON I 90
2M NE LIVNGSTON, Park, MT
Built 1962 Load: 23.6 t ADT: 2,850
NF-6639 RD
PoorOver: BOULDER RIVER 041
35M S SPRINGDALE, Park, MT
Built 1933 Load: 24.5 t ADT: 156
SWANDAL RD
PoorOver: FLATHEAD CREEK 073
3M W WILSALL, Park, MT
Built 1970 Load: 25.1 t ADT: 100
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.