US Bridges

Towell Road over Keithley Creek

Fair

Washington County, Idaho · 1.8 N. 2.0 W. Midvale · Structure no. 000000000028780

Built
1974
51 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

Towell Road over Keithley Creek is a prestressed concrete tee beam carrying Towell Road over Keithley Creek in Washington County, Idaho. It was built in 1974, so it is 51 years old, older 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 30 vehicles a day, roughly 10% of them trucks, projected to reach 45 by 2039. The structure is 35 ft (10.7 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesTowell Road
CrossesKeithley Creek
Location1.8 N. 2.0 W. Midvale
RouteCounty Highway 0
StateIdaho
Coordinates44.49725, -116.77481
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating53 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span34 ft (10.4 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Towell Road over Keithley Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Towell Road over Keithley 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 July 2024.

How much traffic does Towell Road over Keithley Creek carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Towell Road over Keithley Creek?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 24 ft wide.

Who owns Towell Road over Keithley Creek?

It is owned by the County Highway Agency.