How many bridges are in Wyoming?

Wyoming has 3,181 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 structurally deficient?

5.4% of bridges in Wyoming are classified as structurally deficient by the FHWA, compared to a national average of 7.0%.

State profile · Below national median SD

Wyoming bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Wyoming — drawn straight from the FHWA National Bridge Inventory.

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026

3,181
Public bridges: 26.2%
Good condition: 5.4%
Poor condition: 5.4%
Structurally deficient

Total Bridges

3,181

Public highway bridges in Wyoming

Good Condition

26.2%

833 bridges rated 7-9

-23.8pp vs 50% benchmark

Poor Condition

5.4%

172 bridges rated 0-4

Structurally Deficient

5.4%

172 bridges flagged for repair priority

-1.6pp vs national avg 7.0%

Wyoming vs national bridge condition

Wyoming — Good condition share 26.2%

National avg

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

Wyoming — Structurally deficient share 18.0%

National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

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

Wyoming vs nearby ranks

Adjacent states on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Wyoming on the same metric.

Indiana

4.94% top marginal rate

Structure: Progressive
Burden @ $100K: $18,630

Kansas

5.25% top marginal rate

Structure: Progressive
Burden @ $100K: $23,867

Selected

Wyoming

5.41% top marginal rate

Structure: Progressive
Burden @ $100K: $3,181

Idaho

5.51% top marginal rate

Structure: Progressive
Burden @ $100K: $1,742

Mississippi

5.92% top marginal rate

Structure: Progressive
Burden @ $100K: $16,823

Bridges Needing Most Attention in Wyoming

Six lowest-condition bridges in Wyoming, ranked by composite NBI rating. Each is inspected at least every 24 months.

FIREHOLE LAKE DRIV

Structurally Deficient

Over: THERMAL AREA DRAINAGE

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

Built 1935 Load: 3.6 t ADT: 1,500

Sb Cnty Rd 175

Structurally Deficient

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

BLM Road 4116

Structurally Deficient

Over: Big Sandy River

35 Miles Se Of Boulder, Sublette, WY

Built 1982 Load: 5.4 t ADT: 49

NO DATA ENTERED

Poor

Over: NO DATA ENTERED

NO DATA ENTERED, Lincoln, WY

Built 2013 Load: 5.5 t ADT: 50

Sh Cnty Rd 110

Structurally Deficient

Over: Tongue River

7 Mi Nw Of Sheridan, Sheridan, WY

Built 1903 Load: 5.5 t ADT: 179

All Bridges in Wyoming

Sort by:

I-90 EBL

Fair

Over: Machinery Pass

Montana Line - Sheridan, Sheridan, WY

Built 1959 Load: 25.1 t ADT: 3,688

I-90 WBL

Fair

Over: Machinery Pass

Montana Line - Sheridan, Sheridan, WY

Built 1959 Load: 25.1 t ADT: 3,758

I-80 EBL

Fair

Over: Machinery Pass

Evanston - Green River, Uinta, WY

Built 1960 Load: 25.1 t ADT: 7,135

I-80 WBL

Fair

Over: Machinery Pass

Evanston - Green River, Uinta, WY

Built 1960 Load: 25.1 t ADT: 7,481

Pa Cnty Rd 3LD

Fair

Over: Greybull River

5 Mi. Ne Of Meeteetse, Park, WY

Built 1964 Load: 25.2 t ADT: 2,561

US 16

Fair

Over: Big Horn Canal

Worland - Basin, Big Horn, WY

Built 1957 Load: 25.4 t ADT: 2,122

WYO 35

Fair

Over: Sage Creek

Jct Us310 WY 789 - South, Big Horn, WY

Built 1947 Load: 25.4 t ADT: 2,058

US 16

Fair

Over: BNSF Railway

Worland - Basin, Big Horn, WY

Built 1979 Load: 25.4 t ADT: 1,998

I-80 EBL

Fair

Over: Machinery Pass

Rawlins - Laramie, Carbon, WY

Built 1967 Load: 25.4 t ADT: 5,683

I-80 WBL

Fair

Over: Machinery Pass

Rawlins - Laramie, Carbon, WY

Built 1967 Load: 25.4 t ADT: 5,747

Hs Cnty Rd 1

Fair

Over: North Fork Owl Creek

14 Mi Sw Of Hamilton Dome, Hot Springs, WY

Built 1978 Load: 25.4 t ADT: 76

US 89

Fair

Over: Snake River

Afton - Alpine Jct, Lincoln, WY

Built 1957 Load: 25.4 t ADT: 6,269

I-80 EBL

Fair

Over: Machinery Pass

Evanston - Green River, Sweetwater, WY

Built 1967 Load: 25.4 t ADT: 7,490

I-80 WBL

Fair

Over: Machinery Pass

Evanston - Green River, Sweetwater, WY

Built 1967 Load: 25.4 t ADT: 7,705

CAMPGROUND ROAD

Fair

Over: SMALL STREAM

0.9 MILES NORTHEAST OF JU, Teton, WY

Built 1960 Load: 25.4 t ADT: 800

WYO 59

Fair

Over: Olmstead Draw

Gillette - Mont Line, Campbell, WY

Built 1954 Load: 25.5 t ADT: 543