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 5, 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 WBL

Unknown

Over: WYO 59

Gillette Marginal, Campbell, WY

Built 1971 ADT: 24,463

I-90 EBL

Unknown

Over: Butler Speath Road

Gillette Marginal, Campbell, WY

Built 1971 ADT: 5,596

I-90 WBL

Unknown

Over: Butler Speath Road

Gillette Marginal, Campbell, WY

Built 1971 ADT: 5,596

I-90 EBL and WBL

Unknown

Over: BNSF / US 14/16

Gillette Marginal, Campbell, WY

Built 1972 ADT: 8,577

I-90 EBL

Unknown

Over: Hi-Line Road

Gillette - Moorcroft, Campbell, WY

Built 1976 ADT: 744

I-90 WBL

Unknown

Over: Hi-Line Road

Gillette - Moorcroft, Campbell, WY

Built 1976 ADT: 744

Cl Cnty Rd 94

Unknown

Over: I-90

Gillette - Moorcroft, Campbell, WY

Built 1974 ADT: 3,644

Cl Cnty Rd 1

Unknown

Over: I-90

Gillette - Moorcroft, Campbell, WY

Built 1974 ADT: 3,173

I-90 EBL

Unknown

Over: Cl CR 92 (Stewart Road)

Gillette - Moorcroft, Campbell, WY

Built 1974 ADT: 60

I-90 WBL

Unknown

Over: Cl CR 92 (Stewart Road)

Gillette - Moorcroft, Campbell, WY

Built 1974 ADT: 60

BNSF Railway

Unknown

Over: WYO 59

Gillette, Campbell, WY

Built 1981 ADT: 8,247

S Gurley Avenue

Unknown

Over: BNSF / US 14/16

Gillette/Gurley Ave.Viad., Campbell, WY

Built 1982 ADT: 5,678

Cl Cnty Rd 38N

Unknown

Over: I-90

Gillette Marginal, Campbell, WY

Built 1990 ADT: 3,835

BNSF Railway

Unknown

Over: Cl CR 12 (Bishop Road)

T48N R71W S25, Campbell, WY

Built 1986 ADT: 1,213

BNSF Railway

Unknown

Over: Cl CR 12 (Bishop Road)

T48N R71W S25, Campbell, WY

Built 1986 ADT: 1,213

BNSF Railway

Unknown

Over: Cl CR 12 (Bishop Road)

T45N R71W S25, Campbell, WY

Built 1986 ADT: 1,213

BNSF Railway

Unknown

Over: Cl CR 12 (Bishop Road)

19 Miles Se Of Gillette, Campbell, WY

Built 1996 ADT: 71

S Burma Ave

Unknown

Over: I-90

Gillette Marginal, Campbell, WY

Built 2010 ADT: 4,211

BNSF Railway

Unknown

Over: Cl CR 12 (Bishop Road)

19 Mi Se Of Gillette, Campbell, WY

Built 2008 ADT: 71