Johnson County, WY

204 public highway bridges

Johnson County Bridge Snapshot

Johnson County, Wyoming contains 204 public highway bridges in the FHWA National Bridge Inventory. Roughly 22.5% are rated “Good,” 46.1% “Fair,” 2.5% “Poor,” and 2.5% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in WY are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

204

Total Bridges

22.5%

Good

2.5%

Poor

2.5%

Structurally Deficient

Condition Distribution

Good

22.5% (46)

Fair

46.1% (94)

Poor

2.5% (5)

SD

2.5% (5)

All Bridges (204)

Sort:

I-25 NBL

Over: I-25 Service Road

Casper - Kaycee, Johnson, WY

Built 1965 ADT: 79

I-25 SBL

Over: I-25 Service Road

Casper - Kaycee, Johnson, WY

Built 1965 ADT: 301

I-25 NBL

Over: I-25 Service Road

Casper - Kaycee, Johnson, WY

Built 1960 ADT: 79

I-25 SBL

Over: I-25 Service Road

Casper - Kaycee, Johnson, WY

Built 1960 ADT: 79

I-25 NBL

Over: Powder River Rd Intg

Casper - Kaycee, Johnson, WY

Built 1960 ADT: 89

I-25 SBL

Over: Powder River Rd Intg

Casper - Kaycee, Johnson, WY

Built 1960 ADT: 79

I-25 NBL

Over: TTT Road

Casper - Kaycee, Johnson, WY

Built 1960 ADT: 111

I-25 SBL

Over: TTT Road

Casper - Kaycee, Johnson, WY

Built 1960 ADT: 111

Old Barnum Road

Over: I-25

Casper - Kaycee, Johnson, WY

Built 1971 ADT: 1,499

I-25 NBL

Over: WYO 191

Kaycee Marginal, Johnson, WY

Built 1970 ADT: 1,055

I-25 SBL

Over: WYO 191

Kaycee Marginal, Johnson, WY

Built 1970 ADT: 491

N Fork Road

Over: I-25

Kaycee - Buffalo, Johnson, WY

Built 1971 ADT: 1,472

I-25 NBL

Over: WYO 196

Kaycee - Buffalo, Johnson, WY

Built 1969 ADT: 309

I-25 SBL

Over: WYO 196

Kaycee - Buffalo, Johnson, WY

Built 1969 ADT: 309

I-25 NBL

Over: Jo CR 208 (Reno Road)

Kaycee - Buffalo, Johnson, WY

Built 1967 ADT: 97

I-25 SBL

Over: Jo CR 208 (Reno Road)

Kaycee - Buffalo, Johnson, WY

Built 1967 ADT: 97

I-25 NBL

Over: Jo CR 265 (Middle Fork)

Kaycee - Buffalo, Johnson, WY

Built 1968 ADT: 34

I-25 SBL

Over: Jo CR 265 (Middle Fork)

Kaycee - Buffalo, Johnson, WY

Built 1968 ADT: 34

Jo Cnty Rd 13

Over: I-25

Kaycee - Buffalo, Johnson, WY

Built 1968 ADT: 1,967

I-25 NBL

Over: South Main Street

Buffalo Marginal, Johnson, WY

Built 1971 ADT: 1,659

I-25 SBL

Over: South Main Street

Buffalo Marginal, Johnson, WY

Built 1971 ADT: 2,440

I-25 NBL

Over: Jo CR 8 (Stockyard Road)

Buffalo Marginal, Johnson, WY

Built 1971 ADT: 89

I-25 SBL

Over: Jo CR 8 (Stockyard Road)

Buffalo Marginal, Johnson, WY

Built 1971 ADT: 89

I-25 NBL

Over: US 16 (East Hart Street)

Buffalo Marginal, Johnson, WY

Built 1963 ADT: 5,732

I-25 SBL

Over: US 16 (East Hart Street)

Buffalo Marginal, Johnson, WY

Built 1963 ADT: 9,911

I-90 EBL

Over: Lower Piney Creek Road

Sheridan - Buffalo, Johnson, WY

Built 1966 ADT: 599

I-90 WBL

Over: Lower Piney Creek Road

Sheridan - Buffalo, Johnson, WY

Built 1966 ADT: 46

I-90 EBL

Over: Jo CR 85 (Shell Creek)

Sheridan - Buffalo, Johnson, WY

Built 1966 ADT: 55

I-90 WBL

Over: Jo CR 85 (Shell Creek)

Sheridan - Buffalo, Johnson, WY

Built 1966 ADT: 55

I-90 EBL

Over: Jo CR 39 (Lake Ridge Rd)

Sheridan - Buffalo, Johnson, WY

Built 1966 ADT: 97

I-90 WBL

Over: Jo CR 213 (Monument Rd)

Sheridan - Buffalo, Johnson, WY

Built 1966 ADT: 389

I-90 EBL

Over: Jo CR 1 (Rock Creek Rd)

Sheridan - Buffalo, Johnson, WY

Built 1963 ADT: 165

I-90 EBL

Over: North Main Street

Buffalo Marginal, Johnson, WY

Built 1963 ADT: 1,438

I-90 WBL

Over: North Main Street

Buffalo Marginal, Johnson, WY

Built 1963 ADT: 249

I-90 EBL

Over: US 16

Buffalo Marginal, Johnson, WY

Built 1959 ADT: 2,930

I-90 WBL

Over: US 16

Buffalo Marginal, Johnson, WY

Built 1959 ADT: 1,004

I-90 EBL

Over: Jo CR 204 (TW Road)

Buffalo - Gillette, Johnson, WY

Built 1959 ADT: 97

I-90 WBL

Over: Jo CR 204 (TW Road)

Buffalo - Gillette, Johnson, WY

Built 1959 ADT: 97

I-90 EBL

Over: Tipperary Road

Buffalo - Gillette, Johnson, WY

Built 1960 ADT: 97

I-90 WBL

Over: Tipperary Road

Buffalo - Gillette, Johnson, WY

Built 1960 ADT: 97

I-90 EBL

Over: Jo CR 117 (Cook Road)

Buffalo - Gillette, Johnson, WY

Built 1960 ADT: 89

I-90 WBL

Over: Jo CR 117 (Cook Road)

Buffalo - Gillette, Johnson, WY

Built 1960 ADT: 89

I-90 EBL

Over: Jo CR 204A (Dry Creek)

Buffalo - Gillette, Johnson, WY

Built 1960 ADT: 97

I-90 WBL

Over: Jo CR 204A (Dry Creek)

Buffalo - Gillette, Johnson, WY

Built 1960 ADT: 97

I-90 EBL

Over: Crazy Woman Creek Road

Buffalo - Gillette, Johnson, WY

Built 1961 ADT: 89

I-90 WBL

Over: Crazy Woman Creek Road

Buffalo - Gillette, Johnson, WY

Built 1961 ADT: 89

I-90 EBL

Over: Jo CR 204A (Dry Creek)

Buffalo - Gillette, Johnson, WY

Built 1961 ADT: 97

I-90 WBL

Over: Jo CR 204A (Dry Creek)

Buffalo - Gillette, Johnson, WY

Built 1961 ADT: 97

I-90 EBL

Over: Schoonover Road

Buffalo - Gillette, Johnson, WY

Built 1961 ADT: 97

I-90 WBL

Over: Schoonover Road

Buffalo - Gillette, Johnson, WY

Built 1961 ADT: 97

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

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026