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)

Sort:

WYO 487

Over: Bates Creek

Medicine Bow - Jt WYO 220, Natrona, WY

Built 1981 Load: 30.8 t ADT: 832

US 20/26 Conn. WBL

Over: BNSF / Casper Creek

Casper, Natrona, WY

Built 1961 Load: 31.8 t ADT: 5,629

US 20/26 Conn. EBL

Over: BNSF / Casper Creek

Casper, Natrona, WY

Built 1961 Load: 31.8 t ADT: 5,821

WYO 220

Over: North Platte River

Casper, Natrona, WY

Built 1969 Load: 32.4 t ADT: 14,658

I-25 Service Road

Over: Horse Creek

Bar Nunn North, Natrona, WY

Built 1950 Load: 32.7 t ADT: 85

WYO 387

Over: Bothwell Draw

Jct I-25 - Reno Jct, Natrona, WY

Built 1952 Load: 32.7 t ADT: 427

WYO 220

Over: Horse Creek

Muddy Gap Jct-WYO 487 Jct, Natrona, WY

Built 1970 Load: 32.7 t ADT: 2,285

WYO 220

Over: Cottonwood Creek

WYO 487 Jct - Casper, Natrona, WY

Built 1965 Load: 32.7 t ADT: 3,604

WYO 220

Over: BNSF Railway

Casper, Natrona, WY

Built 1969 Load: 32.7 t ADT: 14,551

US 20

Over: South Fork Powder River

Casper - Shoshoni, Natrona, WY

Built 1973 Load: 32.7 t ADT: 2,446

Na Cnty Rd 125

Over: Middle Fork Casper Creek

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

Built 1973 Load: 32.7 t ADT: 124

Na Cnty Rd 106

Over: South Fork Powder River

3 Miles N. Of Powder Rive, Natrona, WY

Built 1979 Load: 32.7 t ADT: 20

WYO 220

Over: Unnamed Draw

Muddy Gap-Casper, Natrona, WY

Built 1970 Load: 32.7 t ADT: 3,604

WYO 220

Over: Garden Creek

Casper, Natrona, WY

Built 2001 Load: 32.7 t ADT: 26,189

Na Cnty Rd 403

Over: Stinking Creek

23 Mi Sw Of Casper, Natrona, WY

Built 2007 Load: 32.7 t ADT: 2

WYO 387

Over: Salt Creek

Jct I-25 - Reno Jct, Natrona, WY

Built 1952 Load: 33.6 t ADT: 427

WYO 220

Over: Rush Creek

Muddy Gap Jct-WYO 487 Jct, Natrona, WY

Built 1968 Load: 33.6 t ADT: 1,771

WYO 220

Over: Bates Creek

Muddy Gap Jct-WYO 487 Jct, Natrona, WY

Built 1963 Load: 33.6 t ADT: 3,066

US 20

Over: Casper Creek

Casper, Natrona, WY

Built 1977 Load: 33.6 t ADT: 11,513

I-25 SBL

Over: Castle Creek

Casper - Kaycee, Natrona, WY

Built 1980 Load: 33.6 t ADT: 1,464

I-25 NBL

Over: Castle Creek

Casper - Kaycee, Natrona, WY

Built 1980 Load: 33.6 t ADT: 1,515

Na Cnty Rd 408

Over: North Platte River

7.5 Miles S.W. Of Alcova, Natrona, WY

Built 1957 Load: 33.6 t ADT: 83

US 20

Over: Middle Fork Casper Creek

Casper-Shoshoni, Natrona, WY

Built 1984 Load: 33.6 t ADT: 2,908

Na Cnty Rd 201

Over: Poison Spider Creek

11 Miles West Of Casper, Natrona, WY

Built 1991 Load: 33.6 t ADT: 937

I-25 SBL

Over: Machinery Pass

Casper - Kaycee, Natrona, WY

Built 1980 Load: 34.5 t ADT: 1,464

Na Cnty Rd 101

Over: Badwater Creek

23 Miles N.W. Of Waltman, Natrona, WY

Built 1984 Load: 34.5 t ADT: 12

Na Cnty Rd 407

Over: North Platte River

Alcova, Natrona, WY

Built 2019 Load: 35.3 t ADT: 63

WYO 258 (Wyo Blvd)

Over: North Platte River

Casper, Natrona, WY

Built 1974 Load: 35.4 t ADT: 11,674

WYO 387

Over: Coal Draw

Midwest - Reno Jct, Natrona, WY

Built 1977 Load: 35.4 t ADT: 2,168

US 20

Over: Middle Fork Casper Creek

Casper-Shoshoni, Natrona, WY

Built 1984 Load: 35.4 t ADT: 2,908

I-25 NBL

Over: Machinery Pass

Douglas - Casper, Natrona, WY

Built 1966 Load: 36.3 t ADT: 4,193

I-25 SBL

Over: Machinery Pass

Douglas - Casper, Natrona, WY

Built 1966 Load: 36.3 t ADT: 4,702

US 20

Over: C and NW Railroad

Casper, Natrona, WY

Built 1977 Load: 36.3 t ADT: 11,513

I-25 SBL

Over: Machinery Pass

Casper - Kaycee, Natrona, WY

Built 1980 Load: 36.3 t ADT: 1,464

I-25 NBL

Over: Machinery Pass

Casper - Kaycee, Natrona, WY

Built 1980 Load: 36.3 t ADT: 1,515

I-25 NBL

Over: Machinery Pass

Casper - Kaycee, Natrona, WY

Built 1980 Load: 36.6 t ADT: 1,515

US 20

Over: Middle Fork Casper Creek

Casper-Shoshoni, Natrona, WY

Built 1984 Load: 38.1 t ADT: 2,908

VeteransCemeteryRd

Over: North Platte River

T34N R079W S36, Natrona, WY

Built 1985 Load: 38.1 t ADT: 100

I-25 SBL

Over: North Platte River

Casper Marginal, Natrona, WY

Built 1956 Load: 41.4 t ADT: 13,026

US 20

Over: Wyatt Draw

Casper - Shoshoni, Natrona, WY

Built 1973 Load: 42.6 t ADT: 2,446

WYO 259

Over: East Teapot Creek

Casper-Midwest Road, Natrona, WY

Built 1999 Load: 42.6 t ADT: 3,812

WYO 257

Over: North Platte River

Casper Streets, Natrona, WY

Built 2013 Load: 43.1 t ADT: 1,066

Na Cnty Rd 403

Over: Bolton Creek

20 Mi. S.W. Of Casper, Natrona, WY

Built 1994 Load: 43.5 t ADT: 2

WYO 259

Over: Teapot Creek

I-25 - Midwest Road, Natrona, WY

Built 1999 Load: 44.5 t ADT: 3,910

WYO 259

Over: Salt Creek

Jct I-25 - Midwest, Natrona, WY

Built 2000 Load: 44.5 t ADT: 3,910

Na Cnty Rd 305

Over: North Platte River

Robertson Rd., Natrona, WY

Built 2002 Load: 45.0 t ADT: 7,337

Na Cnty Rd 410

Over: Sweetwater River

43 Miles S.W. Of Casper, Natrona, WY

Built 1984 Load: 45.4 t ADT: 11

Na Cnty Rd 308

Over: North Platte River

Bessemer Road, CN1-308, Natrona, WY

Built 1997 Load: 49.9 t ADT: 271

WYO 257

Over: Unnamed Draw

Casper Streets, Natrona, WY

Built 2013 Load: 51.5 t ADT: 1,066

WYO 220

Over: North Platte River

13 Mi Sw Of Casper, Natrona, WY

Built 2002 Load: 53.9 t ADT: 3,066

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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Compiled by PlainBridges, Independent data publisher

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.