County profile · official public datasets

Treasure County, MT

26 public highway bridges tracked in the FHWA National Bridge Inventory: 34.6% rated Good, 50% Fair, 15.4% Poor.

Compiled by PlainBridges

26
Public bridges: 34.6%
Good condition: 15.4%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Treasure County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

54th
of 56 on Poor share: 15.4%
Poor-condition share: 26
public highway bridges: 1966
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.

Treasure County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Treasure County ranks #54 of 56 Montana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15.4%). Treasure County, Montana contains 26 public highway bridges. Roughly 34.6% are rated “Good,” 50% “Fair,” and 15.4% “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.

Total bridges

26

Public highway bridges in Treasure County

Good condition

34.6%

9 of 26 rated 7-9

Fair condition

50%

13 of 26 rated 5-6

Poor condition

15.4%

4 of 26 rated 4 or below

In-state Poor-share rank

#54 of 56

Among Montana counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 26 NBI-tracked bridges by lowest applicable component rating.

Good

34.6% (9)

Fair

50% (13)

Poor

15.4% (4)

Treasure County's Poor-condition bridges carry 542 vehicle crossings a day

That is 3.2% of the county's reported daily bridge traffic on 16% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 136 crossings a day against 1,666 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 25 of 26 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

61.5% of Treasure County's bridges have passed the 50-year mark

16 of the 26 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 34.6% 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 51.5% of the county's Poor-condition bridge traffic

FRONTAGE ROAD 018 over IRRIGATION DITCH 001, built 1933, carries 279 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 542 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

1
1930s

5
1950s

1
1960s

5
1970s

10
1980s

1
1990s

1
2010s

2

What this shows Construction peaked in the 1970s, when 10 of the county's bridges still in the inventory were built, which is 38.5% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1966, 11 years older than the Montana average of 1977.

How Treasure County compares with Montana's closest counties by inventory size

The 5 Montana counties nearest Treasure County in number of bridges, with their condition splits. Its 15.4% Poor share is the 6th-lowest of these 6. Its average build year of 1966 against a peer-group mean of 1977 is 11 years older.

Showing the 5 closest of 55 Montana counties eligible for comparison.

Bridge inventory size and condition shares for Treasure County and the 5 Montana counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Musselshell County	28	57.1%	39.3%	3.6%	1986
Garfield County	26	38.5%	57.7%	3.8%	1989
Petroleum County	26	30.8%	53.8%	15.4%	1967
Wheatland County	26	30.8%	61.5%	7.7%	1967
Treasure County (this page)	26	34.6%	50%	15.4%	1966
Wibaux County	25	12%	84%	4%	1975

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 Treasure 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 Treasure County, both outside Montana so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MT (26 bridges here).

Mineral County, CO · 26 bridges
Webster County, GA · 26 bridges
St. James County, LA · 26 bridges
Deaf Smith County, TX · 26 bridges

Similar average build year

Nearest mean year-built outside MT (1966 here).

Butler County, KS · avg 1966 · 591 bridges
Grafton County, NH · avg 1966 · 544 bridges
Queens County, NY · avg 1966 · 514 bridges
Lehigh County, PA · avg 1966 · 381 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 26 Good 9 Fair 13 Poor 4

All bridges (26)

Sort:

RIVER RD

Over: IRRIGATION DITCH 020

2M W HYSHAM, Treasure, MT

Built 1978 Load: 4.5 t ADT: 17

MYERS RD

Over: YELLOWSTONE RIVER

MYERS, Treasure, MT

Built 1968 Load: 8.7 t ADT: 95

PUMPHOUSE RD

Over: IRRIGATION DITCH 006

1M NW HYSHAM, Treasure, MT

Built 1955 Load: 9.1 t ADT: 168

WILSON RD

Over: SARPY CREEK 012

22M S HYSHAM, Treasure, MT

Built 1970 Load: 9.1 t

TULLOCK RD

Over: WEST BURNT CREEK 019

10M SE BIGHORN, Treasure, MT

Built 1970 Load: 12.7 t ADT: 35

OLD HWY 10

Over: IRRIGATION DITCH 022

9M E HYSHAM, Treasure, MT

Built 2011 Load: 19.1 t ADT: 218

FRONTAGE ROAD 018

Over: DRAINAGE 010

4M E HYSHAM, Treasure, MT

Built 1933 Load: 22.7 t ADT: 218

HAINES RANCH RD

Over: SEP I 94 016

3M SE SANDERS, Treasure, MT

Built 1976 Load: 23.6 t ADT: 100

SARPY CREEK RD

Over: INT SARPY CREEK I 94

2M SW SANDERS, Treasure, MT

Built 1967 Load: 24.4 t ADT: 100

OLD HWY 10

Over: IRRIGATION DITCH 024

10M E HYSHAM, Treasure, MT

Built 1933 Load: 28.1 t ADT: 271

OLD HWY 10

Over: DRAINAGE 015

6M E HYSHAM, Treasure, MT

Built 1933 Load: 29.0 t ADT: 218

INGOMAR RD

Over: MUGGINS CREEK 004

2M NW MYERS, Treasure, MT

Built 1970 Load: 43.5 t ADT: 100

SARPY CREEK RD

Over: SARPY CREEK

4M SW SANDERS, Treasure, MT

Built 1990 Load: 84.4 t ADT: 84

TULLOCK RD

Over: INT BIGHORN I 94 002

1M S BIGHORN, Treasure, MT

Built 1963 Load: 20.0 t ADT: 100

I 94

Over: SARPY CREEK

18.6M E BIGHORN, Treasure, MT

Built 1976 Load: 21.8 t ADT: 2,067

I 94

Over: INT HYSHAM

14.9M E BIGHORN, Treasure, MT

Built 1976 Load: 24.5 t ADT: 2,489

MISSION VALLEY RD

Over: FROZE TO DEATH CR 013

2M NW MYERS, Treasure, MT

Built 1986 Load: 27.2 t ADT: 9

I 94

Over: SARPY CREEK

18.6M E BIGHORN, Treasure, MT

Built 1967 Load: 28.1 t ADT: 2,489

OLD HWY 10

Over: SARPY CREEK 014

5M E HYSHAM, Treasure, MT

Built 2015 Load: 29.0 t ADT: 218

MEYERS RD

Over: ALKALI CREEK

4M NW MYERS, Treasure, MT

Built 1977 Load: 29.9 t ADT: 95

I 94

Over: INT HYSHAM

14.9M E BIGHORN, Treasure, MT

Built 1964 Load: 30.8 t ADT: 2,554

I 94

Over: SEP RR

18.6M E BIGHORN, Treasure, MT

Built 1973 Load: 99.9 t ADT: 4,977

FRONTAGE RD

Over: SARPY CREEK 003

4M E HYSHAM, Treasure, MT

Built 1925 Load: 5.4 t ADT: 28

RIVER RD

Over: IRRIGATION DITCH 005

3M W HYSHAM, Treasure, MT

Built 1979 Load: 5.4 t ADT: 17

FRONTAGE ROAD 018

Over: IRRIGATION DITCH 001

1M E HYSHAM, Treasure, MT

Built 1933 Load: 21.8 t ADT: 279

FRONTAGE ROAD 018

Over: DRAINAGE 009

4M E HYSHAM, Treasure, MT

Built 1933 Load: 25.4 t ADT: 218

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

Related

Browse all → | Rankings →

Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

P

Compiled by PlainBridges, Independent data publisher

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.