Natrona County, WY

138 public highway bridges

Natrona County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Natrona County, Wyoming contains 138 public highway bridges. Roughly 22.5% are rated “Good,” 47.1% “Fair,” and 3.6% “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.

138
Total Bridges
22.5%
Good
47.1%
Fair
3.6%
Poor Condition

Condition Distribution

Good
22.5% (31)
Fair
47.1% (65)
Poor
3.6% (5)

All Bridges (138)

WYO 256

Fair

Over: North Platte River

Jct Us 20 2687 - North, Natrona, WY

Built 1971 Load: 54.2 t ADT: 3,014

US 20

Fair

Over: North Platte River

Casper, Natrona, WY

Built 1979 Load: 76.2 t ADT: 12,085

I-25 Service Road

Good

Over: Sheep Creek

Bar Nunn North, Natrona, WY

Built 1950 Load: 12.4 t ADT: 85

I-25 Service Road

Good

Over: Unnamed Draw

Bar Nunn North, Natrona, WY

Built 1948 Load: 17.2 t ADT: 85

US 20/26/87 EBL

Good

Over: Elkhorn Creek

East Yellowstone - Casper, Natrona, WY

Built 1957 Load: 21.9 t ADT: 3,035

US 20/26/87 WBL

Good

Over: Elkhorn Creek

East Yellowstone - Casper, Natrona, WY

Built 1957 Load: 23.5 t ADT: 2,396

WYO 253

Good

Over: Dry Muddy Creek

Jct Us 20 2687 - South, Natrona, WY

Built 1955 Load: 28.1 t ADT: 460

US 20

Good

Over: Johnson Canal

Casper - Shoshoni, Natrona, WY

Built 1976 Load: 30.0 t ADT: 2,908

Na Cnty Rd 316

Good

Over: Casper Canal

20 Miles Sw Of Casper, Natrona, WY

Built 2003 Load: 30.8 t ADT: 5

W 25th Street

Good

Over: Garden Creek

Casper Streets, Natrona, WY

Built 1960 Load: 31.4 t ADT: 6,586

Na Cnty Rd 319

Good

Over: Casper Canal

Oregon Trail Road, Natrona, WY

Built 1998 Load: 31.8 t ADT: 6

I-25 NBL

Good

Over: Dry Muddy Creek

Douglas - Casper, Natrona, WY

Built 1966 Load: 32.7 t ADT: 4,193

I-25 SBL

Good

Over: Dry Muddy Creek

Douglas - Casper, Natrona, WY

Built 1966 Load: 32.7 t ADT: 4,702

WYO 487

Good

Over: Little Red Creek

Medicine Bow - Jt WYO 220, Natrona, WY

Built 1984 Load: 32.7 t ADT: 832

Na Cnty Rd 319

Good

Over: Casper Canal

14 Miles E. Of Casper, Natrona, WY

Built 1992 Load: 32.7 t ADT: 6

Na Cnty Rd 319

Good

Over: Casper Canal

15 Miles East Of Casper, Natrona, WY

Built 1998 Load: 32.7 t ADT: 6

E 2nd Street

Good

Over: Elkhorn Creek

Casper Streets, Natrona, WY

Built 2003 Load: 32.7 t ADT: 11,792

E 2nd Street

Good

Over: Claude Creek

East Casper, Natrona, WY

Built 2004 Load: 32.7 t ADT: 11,792

Na Cnty Rd 305

Good

Over: Unnamed Draw

Casper, Natrona, WY

Built 2015 Load: 32.7 t ADT: 5,027

I-25 NBL

Good

Over: Dugout Creek

Casper - Kaycee, Natrona, WY

Built 1979 Load: 33.6 t ADT: 1,499

I-25 SBL

Good

Over: Dugout Creek

Casper - Kaycee, Natrona, WY

Built 1979 Load: 33.6 t ADT: 1,439

Bryan Stock Trail

Good

Over: North Platte River

Casper, Natrona, WY

Built 1982 Load: 33.6 t ADT: 2,878

W 13th Street

Good

Over: Garden Creek

13Th St - Casper, Natrona, WY

Built 1992 Load: 33.6 t ADT: 6,940

US 20

Good

Over: Casper Canal

Casper - Shoshoni, Natrona, WY

Built 1976 Load: 34.3 t ADT: 2,908

I-25 NBL

Good

Over: Machinery Pass

Casper - Kaycee, Natrona, WY

Built 1972 Load: 34.5 t ADT: 2,677

I-25 SBL

Good

Over: Machinery Pass

Casper - Kaycee, Natrona, WY

Built 1972 Load: 34.5 t ADT: 2,648

US 20

Good

Over: South Fork Casper Creek

Casper - Shoshoni, Natrona, WY

Built 1976 Load: 36.3 t ADT: 2,908

Na Cnty Rd 402

Good

Over: Bates Creek

9 Mi SW of Rd Crk School, Natrona, WY

Built 2021 Load: 41.1 t ADT: 23

Na Cnty Rd 316

Good

Over: Casper Canal

15 Mi Sw Of Casper, Natrona, WY

Built 2004 Load: 45.4 t ADT: 5

Na Cnty Rd 106

Good

Over: BNSF Railway

Powder River Streets, Natrona, WY

Built 2022 Load: 45.4 t ADT: 20

Na Cnty Rd 131

Good

Over: Salt Creek

Midwest, Natrona, WY

Built 2012 Load: 46.8 t ADT: 596

I-25 NBL

Good

Over: South Fork Castle Creek

Casper - Kaycee, Natrona, WY

Built 1981 Load: 50.8 t ADT: 1,515

I-25 SBL

Good

Over: South Fork Castle Creek

Casper - Kaycee, Natrona, WY

Built 1981 Load: 50.8 t ADT: 1,464

Na Cnty Rd 412

Poor

Over: Hogback Draw

3 Miles Northeast Alcova, Natrona, WY

Built 1929 Load: 6.5 t ADT: 87

Na Cnty Rd 102

Poor

Over: Badwater Creek

20 Miles N.W. Of Arminto, Natrona, WY

Built 1940 Load: 11.8 t ADT: 22

Na Cnty Rd 110

Poor

Over: South Fork Powder River

44 Miles N.W. Of Casper, Natrona, WY

Built 1977 Load: 29.0 t ADT: 53

WYO 220

Poor

Over: Sweetwater River

Muddy Gap Jct-WYO 487 Jct, Natrona, WY

Built 1970 Load: 32.7 t ADT: 1,771

WYO 220

Poor

Over: Casper Canal

Muddy Gap Jct-WYO 487 Jct, Natrona, WY

Built 1967 Load: 39.0 t ADT: 3,066

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

Every figure on PlainBridge 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.