US Bridges

Road 57 over Swallow Drain

Fair

Glenn County, California · 1.0 MI W RD V · Structure no. 11C0138

Built
1945
80 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete Continuous
Length
33 ft
3 main spans
Daily traffic
45
2018 count
Owner
County
County Highway Agency

About this bridge

Road 57 over Swallow Drain is a concrete continuous culvert carrying Road 57 over Swallow Drain in Glenn County, California. It was built in 1945, so it is 80 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 45 vehicles a day, projected to reach 56 by 2042. The structure is 33 ft (10.1 m) long and 23 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesRoad 57
CrossesSwallow Drain
Location1.0 MI W RD V
RouteCounty Highway 0
Coordinates39.49288, -122.08429
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span10 ft (3 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2018)
Projected traffic56 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Road 57 over Swallow Drain built?

It was built in 1945, making it 80 years old in 2025.

What condition is Road 57 over Swallow Drain 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 February 2024.

How much traffic does Road 57 over Swallow Drain carry?

About 45 vehicles per day (2018 count).

How long is Road 57 over Swallow Drain?

The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3 m) and a deck 23 ft wide.

Who owns Road 57 over Swallow Drain?

It is owned by the County Highway Agency.