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 in Poor condition?

5.4% of bridge records in Wyoming are in Poor condition, meaning the lowest applicable major-component rating is 4 or below, compared with 7.0% across state inventories.

State profile · Below median Poor share

Wyoming bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Wyoming, based on the FHWA National Bridge Inventory.

Compiled by PlainBridges, Independent data publisher

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

Data updated May 2026

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 whose lowest applicable component is rated 0-4

-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 - Poor-condition 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 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.

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 the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

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

BLM Road 4116

Poor

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

Poor

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-25 NBL

Unknown

Over: Ormsby Road

Casper - Kaycee, Natrona, WY

Built 1971 ADT: 83

I-25 SBL

Unknown

Over: Ormsby Road

Casper - Kaycee, Natrona, WY

Built 1971 ADT: 83

Hereford Lane

Unknown

Over: I-25

Casper Marginal, Natrona, WY

Built 1960 ADT: 11,987

US 20/26 Conn. EBL

Unknown

Over: Na County Road 129

Casper, Natrona, WY

Built 1960 ADT: 105

US 20/26 Conn. WBL

Unknown

Over: Na County Road 129

Casper, Natrona, WY

Built 1960 ADT: 105

WYO 253

Unknown

Over: I-25

Casper Marginal, Natrona, WY

Built 1968 ADT: 4,702

US 20/26/87

Unknown

Over: I-25

Casper Marginal, Natrona, WY

Built 1968 ADT: 12,268

BNSF Railway

Unknown

Over: North Center Street

Center Street Casper, Natrona, WY

Built 1941 ADT: 7,099

Shepperson Road

Unknown

Over: I-25

Casper - Kaycee, Natrona, WY

Built 1980 ADT: 1,464

I-25 SBL

Unknown

Over: Na CR 115 (Smokey Gap)

Casper - Kaycee, Natrona, WY

Built 1980 ADT: 8

I-25 NBL

Unknown

Over: WYO 387

Casper - Kaycee, Natrona, WY

Built 1980 ADT: 427

I-25 NBL

Unknown

Over: I-25 Service Road

Casper - Kaycee, Natrona, WY

Built 1980 ADT: 5

I-25 SBL

Unknown

Over: I-25 Service Road

Casper - Kaycee, Natrona, WY

Built 1980 ADT: 5

I-25 SBL

Unknown

Over: North McKinley Street

Casper Marginal, Natrona, WY

Built 1958 ADT: 1,829

I-25 SBL

Unknown

Over: North Center Street

Casper Marginal, Natrona, WY

Built 1958 ADT: 7,099

Unnamed Road

Unknown

Over: I-25

Casper - Kaycee, Natrona, WY

Built 1981 ADT: 1,515

I-25 NBL

Unknown

Over: WYO 259

Casper - Kaycee, Natrona, WY

Built 1976 ADT: 3,812

I-25 SBL

Unknown

Over: WYO 259

Casper - Kaycee, Natrona, WY

Built 1976 ADT: 1,106

BNSF Railway

Unknown

Over: North McKinley Street

McKinley Street Casper, Natrona, WY

Built 1945 ADT: 4,863

I-25 NBL

Unknown

Over: US 20 / 26 Connector

Casper Marginal, Natrona, WY

Built 1984 ADT: 1,672

I-25 SBL

Unknown

Over: US 20 / 26 Connector

Casper Marginal, Natrona, WY

Built 1984 ADT: 4,485

I-25 NBL

Unknown

Over: WYO 220

Casper Marginal, Natrona, WY

Built 1985 ADT: 14,551

I-25 SBL

Unknown

Over: WYO 220

Casper Marginal, Natrona, WY

Built 1985 ADT: 14,551

Ranch Road

Unknown

Over: I-25

Casper - Kaycee, Natrona, WY

Built 2002 ADT: 1,464

I-25 NBL

Unknown

Over: WYO 258 (Wyoming Blvd)

Casper Marginal, Natrona, WY

Built 2006 ADT: 12,576

I-25 SBL

Unknown

Over: WYO 258 (Wyoming Blvd)

Casper Marginal, Natrona, WY

Built 2007 ADT: 12,576

WYO 254

Unknown

Over: US 20 / 26 Connector

Casper, Natrona, WY

Built 2015 ADT: 5,629

I-25 NBL and SBL

Unknown

Over: Walsh Drive

Casper Marginal, Natrona, WY

Built 2022 ADT: 5,717

I-25 NBL

Unknown

Over: South Chugwater Hwy

Cheyenne - Chugwater, Platte, WY

Built 1969 ADT: 86

I-25 SBL

Unknown

Over: South Chugwater Hwy

Cheyenne - Chugwater, Platte, WY

Built 1969 ADT: 86

I-25 NBL

Unknown

Over: WYO 321

Chugwater Marginal, Platte, WY

Built 1968 ADT: 945

I-25 SBL

Unknown

Over: WYO 211

Chugwater Marginal, Platte, WY

Built 1968 ADT: 1,798