Scour-Critical Bridges in Wyoming

Wyoming has 49 bridges rated scour-critical by the Federal Highway Administration. These bridges have foundations that are unstable or at risk of undermining during flood events. Scour-critical doesn't mean a bridge is about to collapse — it means extra monitoring and countermeasures are in place — but these structures are priorities for repair or replacement.

How this ranking works

This state list filters to NBI scour ratings 0 through 3, then sorts by average daily traffic. It is intended to show flood-vulnerability exposure, not to label any bridge as currently unsafe.

Bridge	County	Scour Rating	Daily Traffic	Condition
Wyo 59 over Donkey Creek	Campbell	3 — Serious	22,352	Fair
I-25 Sbl over Laprele Creek	Converse	3 — Serious	4,769	Fair
I-25 Nbl over Little Boxelder Creek	Converse	3 — Serious	4,762	Fair
I-25 Sbl over Little Boxelder Creek	Converse	3 — Serious	4,762	Fair
I-25 Nbl over Laprele Creek	Converse	3 — Serious	4,607	Fair
Bear River Drive over Bear River	Uinta	3 — Serious	2,961	Poor
US 20 over Big Horn River	Hot Springs	3 — Serious	2,711	Fair
West Entrance Road over Madison River	Teton	3 — Serious	2,525	Poor
Northeast Entrance over Yellowstone River	Park	3 — Serious	1,982	Poor
Grand Loop Road over Firehole River	Teton	3 — Serious	1,807	Fair
Grand Loop Road over Lava Creek	Teton	3 — Serious	1,807	Fair
Beartooth Highway over Fox Creek	Park	3 — Serious	1,775	Fair
Beartooth Highway over Crazy Creek	Park	3 — Serious	1,775	Fair
US 16 over Skull Creek	Weston	3 — Serious	1,753	Good
E Heald Street over Little Goose Creek	Sheridan	3 — Serious	1,708	Poor
US 87 Bus over Little Goose Creek	Sheridan	3 — Serious	1,679	Fair
Beartooth Highway over Index Creek	Park	3 — Serious	1,600	Fair
US 30 over Floodwater Creek	Albany	3 — Serious	1,530	Poor
Wyo 51 over Donkey Creek Overflow	Campbell	3 — Serious	1,326	Fair
Wyo 51 over Donkey Creek	Campbell	3 — Serious	1,326	Fair
Wyo 51 over Well Creek	Crook	3 — Serious	1,326	Fair
Wyo 51 over Donkey Creek	Crook	3 — Serious	1,326	Fair
Campground Road over Small Stream	Teton	3 — Serious	800	Fair
Wyo 336 over Prairie Dog Creek	Sheridan	3 — Serious	583	Good
Te Cnty RD 5 over Box Creek	Teton	3 — Serious	529	Good
Wyo 313 over Chugwater Creek	Platte	3 — Serious	307	Fair
Ui Cnty RD 253 over Smiths Fork River	Uinta	3 — Serious	271	Fair
Wyo 31 over Medicine Lodge Creek	Big Horn	3 — Serious	216	Fair
Fr Cnty RD 345 over N Fork Little Wind River	Fremont	3 — Serious	193	Good
Fr Cnty RD 345 over S Fork Little Wind River	Fremont	3 — Serious	193	Fair
Wyo 319 over Middle Fork Bear Creek	Platte	3 — Serious	182	Fair
US 30 Service Road over Twin Creek	Lincoln	3 — Serious	153	Fair
Co Cnty RD 29 over Laprele Creek	Converse	3 — Serious	147	Poor
Pa Cnty RD L7b over Bitter Creek	Park	3 — Serious	130	Fair
Jo Cnty RD 195 over Crazy Woman Creek	Johnson	3 — Serious	98	Good
Wyo 434 over Otter Creek	Washakie	3 — Serious	96	Fair
Ui Cnty RD 243 over Smiths Fork River	Uinta	3 — Serious	73	Fair
Go Cnty RD 15e over Laramie River	Goshen	3 — Serious	69	Good
Unnamed Road over Boozer Creek	Carbon	3 — Serious	60	Good
BLM Road 4116 over Big Sandy River	Sublette	3 — Serious	60	Poor
Fdr over Little Rock Creek	Park	2 — Critical	50	Poor
I-25 Service Road over Horse Creek	Laramie	3 — Serious	44	Fair
2302: Hudson-atlan over Strawberry Creek	Fremont	3 — Serious	40	Fair
LN Cnty RD 136 over Salt Creek	Lincoln	3 — Serious	40	Poor
CR Cnty RD 269 over Little Missouri River	Crook	3 — Serious	38	Fair
1405: Neiber Road over Nowater Creek	Washakie	3 — Serious	30	Good
3306: Muddy Creek over Muddy Creek	Carbon	3 — Serious	25	Good
Fr Cnty RD 523 over Twin Creek	Fremont	3 — Serious	8	Poor
Ni Cnty RD 9 over Cheyenne River	Niobrara	3 — Serious	3	Poor