US Bridges

US 95 over Keithly Creek

Fair

Washington County, Idaho · 1.4 N. Midvale · Structure no. 000000000018161

Built
1991
34 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
104 ft
1 main span
Daily traffic
4,400
2023 count
Owner
State
State Highway Agency

About this bridge

US 95 over Keithly Creek is a prestressed concrete stringer/multi-beam or girder carrying US 95 over Keithly Creek in Washington 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 4,400 vehicles a day, roughly 11% of them trucks, projected to reach 6,600 by 2042. The structure is 104 ft (31.7 m) long and 40 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 95
CrossesKeithly Creek
Location1.4 N. Midvale
RouteU.S. Route 95
CountyWashington County
StateIdaho
Coordinates44.49336, -116.72786
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length104 ft (31.7 m)
Longest span102 ft (31.2 m)
Deck width40 ft (12.1 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,400 (2023)
Projected traffic6,600 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$1.4 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 95 over Keithly Creek built?

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

What condition is US 95 over Keithly Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does US 95 over Keithly Creek carry?

About 4,400 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 95 over Keithly Creek?

The structure is 104 ft (31.7 m) long with a longest span of 102 ft (31.2 m) and a deck 40 ft wide.

Who owns US 95 over Keithly Creek?

It is owned by the State Highway Agency.