How many bridges are in Wyoming?

Wyoming has 3,136 public highway bridges tracked in the FHWA National Bridge Inventory. View detailed condition data for each bridge on PlainBridges.

What percentage of bridges in Wyoming are in Poor condition?

6.5% of bridge records in Wyoming are in Poor condition, meaning the lowest applicable major-component rating is 4 or below, compared with 7.5% across state inventories.

State profile · Near median Poor share

Wyoming bridge safety

Name: Wyoming public highway bridge inventory (FHWA NBI)
Creator: PlainBridges
License: https://creativecommons.org/publicdomain/zero/1.0/

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in Wyoming.

Compiled by PlainBridges

3,136
Public bridges: 30.1%
Good condition: 6.5%
Poor condition

Wyoming holds 3,136 public highway bridges (#41 of 52 by inventory) with a 6.51% Poor share (#24 of 52 by Poor share).

That is 6.5% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 29 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

3,136

Public highway bridges in Wyoming

Good Condition

30.1%

943 bridges rated 7-9

-19.9pp vs 50% benchmark

Poor Condition

6.5%

204 bridges whose lowest applicable component is rated 0-4

-1.0pp vs national avg 7.5%

Wyoming vs national bridge condition

Wyoming - Good condition share 30.1%

National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Wyoming - Poor-condition share 21.7%

National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

Inventory size and Poor-condition share are different measures: Wyoming has 3,136 bridges and a 6.5% Poor-condition share in the 2024 NBI, rank #29 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

Wyoming vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

3,136 41st of 54 higher than 13 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for Wyoming

The highlighted point is Wyoming: 3,136 bridges and 6.51% in Poor condition, rank #29 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below Wyoming on that same Poor-share ordering:

Mississippi: 16,739 bridges · 6.03% Poor
South Carolina: 9,490 bridges · 6.17% Poor
Wyoming: 3,136 bridges · 6.51% Poor
Wisconsin: 14,446 bridges · 6.52% Poor
Hawaii: 1,195 bridges · 6.53% Poor

The full national sortable table lives on the rankings page.

Material families in Wyoming

Exclusive FHWA material families across all 3,136 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Concrete 1,258 bridges (40%) Prestressed concrete 262 bridges (8%) Steel 1,469 bridges (47%) Wood or timber 142 bridges (5%) Other 5 bridges (0%)

Who maintains Wyoming’s inventory

State agency holds 62.9% of the 3,136 public highway bridges filed under Wyoming in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

State agency 1,973 bridges (63%) County agency 700 bridges (22%) Local agency 132 bridges (4%) Federal agency 327 bridges (10%) Other 4 bridges (0%)

When Wyoming’s bridges were built

Pre-1950 construction accounts for 5.2% of the 3,136 bridges with a recorded original year in Wyoming. Era bands are orthogonal to the Poor-share ranking above.

Pre-1950 163 bridges (5%) 1950–1979 1,733 bridges (55%) 1980–1999 739 bridges (24%) 2000+ 501 bridges (16%)

Condition Distribution

Bridge inventory deck-condition mix - Wyoming (FHWA NBI)

Wyoming vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Wyoming on the same metric.

Mississippi

6.03% top marginal rate

Structure: Progressive
Burden @ $100K: $16,739

South Carolina

6.17% top marginal rate

Structure: Progressive
Burden @ $100K: $9,490

Selected

Wyoming

6.51% top marginal rate

Structure: Progressive
Burden @ $100K: $3,136

Wisconsin

6.52% top marginal rate

Structure: Progressive
Burden @ $100K: $14,446

Hawaii

6.53% top marginal rate

Structure: Progressive
Burden @ $100K: $1,195

Bridges Needing Most Attention in Wyoming

Six lowest-condition bridges in Wyoming, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

We Cnty Rd 1A

Poor

Over: Beaver Creek

23 Miles Se Of Newcastle, Weston, WY

Built 1933 Load: 0.0 t ADT: 136

Wa Cnty Rd 580

Poor

Over: East Fork Sand Creek

8 Mi+East Of Worland, Washakie, WY

Built 1935 Load: 0.0 t ADT: 4

Fr Cnty Rd 523

Poor

Over: Twin Creek

15 Mi. S.E. Of Lander, Fremont, WY

Built 1932 Load: 0.0 t ADT: 8

FIREHOLE LAKE DRIV

Poor

Over: THERMAL AREA DRAINAGE

10 +/- MI. SOUTH OF MADIS, Teton, WY

Built 1935 Load: 3.6 t ADT: 1,500

Sb Cnty Rd 175

Poor

Over: New Fork River

T30N R110W S22, Sublette, WY

Built 1940 Load: 4.3 t ADT: 11

Cb Cnty Rd 680

Poor

Over: Encampment River

4 Miles N. Of Encampment, Carbon, WY

Built 1915 Load: 4.9 t ADT: 70

All Bridges in Wyoming

Sort by:

Wyoming vs national bridge condition

Material families in Wyoming

Who maintains Wyoming’s inventory

When Wyoming’s bridges were built

Condition Distribution

Counties (23)

Bridges Needing Most Attention in Wyoming

We Cnty Rd 1A

Wa Cnty Rd 580

Fr Cnty Rd 523

FIREHOLE LAKE DRIV

Sb Cnty Rd 175

Cb Cnty Rd 680

All Bridges in Wyoming

I-25 SBL

La Cnty Rd 120-1

I-25 NBL

I-25 SBL

I-25 NBL

I-25 SBL

I-25 NBL

I-25 NBL

Unnamed Road

I-25 NBL

I-25 SBL

I-80 EBL

I-80 WBL

I-80 EBL

I-80 WBL

I-80 WBL

I-80 EBL

I-80 WBL

I-80 WBL

I-80 EBL

I-80 WBL

I-80 EBL

I-80 WBL

I-90 WBL

I-90 EBL

I-90 WBL

I-90 EBL

I-90 WBL

US 287

WYO 272

US 20/26 Conn. EBL

US 20/26 Conn. WBL

WYO 211

I-80 EBL Off Ramp

WYO 59

Spring Drive

Fr Cnty Rd 286

Sh Cnty Rd 89

WYO 450

Sh Cnty Rd 81

I-25 NBL

I-25 NBL

I-80 EBL

I-80 WBL

I-80 EBL

I-80 WBL

I-80 EBL

I-80 WBL

I-90 EBL

I-90 WBL

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