US Bridges

Keyes Road over Highline Canal

Good

Stanislaus County, California · 0.3 MI E of Hall RD · Structure no. 38C0246

Built
1990
35 years old
Condition
Good
inspected February 2025
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
1,126
2016 count
Owner
County
County Highway Agency

About this bridge

Keyes Road over Highline Canal is a concrete slab carrying Keyes Road over Highline Canal in Stanislaus County, California. It was built in 1990, so it is 35 years old, younger than the California average of 54.8 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 1,126 vehicles a day, roughly 30% of them trucks, projected to reach 1,540 by 2045. The structure is 32 ft (9.8 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesKeyes Road
CrossesHighline Canal
Location0.3 MI E of Hall RD
RouteCounty Highway 0
Coordinates37.5511, -120.73107
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length32 ft (9.8 m)
Longest span30 ft (9 m)
Deck width33 ft (10.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,126 (2016)
Projected traffic1,540 by 2045
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Keyes Road over Highline Canal built?

It was built in 1990, making it 35 years old in 2025.

What condition is Keyes Road over Highline Canal 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 February 2025.

How much traffic does Keyes Road over Highline Canal carry?

About 1,126 vehicles per day (2016 count), of which roughly 30% are trucks.

How long is Keyes Road over Highline Canal?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9 m) and a deck 33 ft wide.

Who owns Keyes Road over Highline Canal?

It is owned by the County Highway Agency.