US Bridges

US 20 over Dry Creek

Good

Blaine County, Idaho · 0.9 W. Carey · Structure no. 000000000015109

Built
1991
34 years old
Condition
Good
inspected May 2021
Type
Culvert
Steel
Length
54 ft
2 main spans
Daily traffic
2,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 over Dry Creek is a steel culvert carrying US 20 over Dry Creek in Blaine County, Idaho. It was built in 1991, so it is 34 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,000 vehicles a day, roughly 20% of them trucks, projected to reach 3,000 by 2042. The structure is 54 ft (16.5 m) long and 163 ft wide. If it were closed, the detour would be 47.8 mi (77 km).

CarriesUS 20
CrossesDry Creek
Location0.9 W. Carey
RouteU.S. Route 20
StateIdaho
Coordinates43.29972, -113.96222
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length54 ft (16.5 m)
Longest span24 ft (7.3 m)
Deck width163 ft (49.7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic3,000 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.8 mi (77 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$772,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 over Dry Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is US 20 over Dry Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2021.

How much traffic does US 20 over Dry Creek carry?

About 2,000 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is US 20 over Dry Creek?

The structure is 54 ft (16.5 m) long with a longest span of 24 ft (7.3 m) and a deck 163 ft wide.

Who owns US 20 over Dry Creek?

It is owned by the State Highway Agency.