US Bridges

Hay Road over Old Alamo Creek

Fair

Solano County, California · 0.6 MI West of HWY 113 · Structure no. 23C0205

Built
1935
90 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
23 ft
3 main spans
Daily traffic
543
2009 count
Owner
County
County Highway Agency

About this bridge

Hay Road over Old Alamo Creek is a concrete continuous culvert carrying Hay Road over Old Alamo Creek in Solano County, California. It was built in 1935, so it is 90 years old, older than the California average of 54.8 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 543 vehicles a day, roughly 6% of them trucks, projected to reach 1,199 by 2041. The structure is 23 ft (7 m) long and 26 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesHay Road
CrossesOld Alamo Creek
Location0.6 MI West of HWY 113
RouteCounty Highway 0
CountySolano County
StateCalifornia
Coordinates38.31504, -121.83326
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length23 ft (7 m)
Longest span7 ft (2.1 m)
Deck width26 ft (8 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic543 (2009)
Projected traffic1,199 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hay Road over Old Alamo Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is Hay Road over Old Alamo 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 March 2023.

How much traffic does Hay Road over Old Alamo Creek carry?

About 543 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is Hay Road over Old Alamo Creek?

The structure is 23 ft (7 m) long with a longest span of 7 ft (2.1 m) and a deck 26 ft wide.

Who owns Hay Road over Old Alamo Creek?

It is owned by the County Highway Agency.