US Bridges

County Road 31 over Interstate 505

Fair

Yolo County, California · 03-YOL-505-2.50 · Structure no. 22 0160

Built
1980
45 years old
Condition
Fair
inspected May 2021
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
199 ft
2 main spans
Daily traffic
500
2005 count
Owner
State
State Highway Agency

About this bridge

County Road 31 over Interstate 505 is a prestressed concrete continuous box beam or girders - multiple carrying County Road 31 over Interstate 505 in Yolo County, California. It was built in 1980, so it is 45 years old, younger 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 813 by 2041. The structure is 199 ft (60.6 m) long and 44 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty Road 31
CrossesInterstate 505
Location03-YOL-505-2.50
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.56179, -121.95349
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.3 US tons
Inventory rating42.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length199 ft (60.6 m)
Longest span98 ft (29.8 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2005)
Projected traffic813 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 County Road 31 over Interstate 505 built?

It was built in 1980, making it 45 years old in 2025.

What condition is County Road 31 over Interstate 505 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 May 2021.

How much traffic does County Road 31 over Interstate 505 carry?

About 500 vehicles per day (2005 count), of which roughly 10% are trucks.

How long is County Road 31 over Interstate 505?

The structure is 199 ft (60.6 m) long with a longest span of 98 ft (29.8 m) and a deck 44 ft wide.

Who owns County Road 31 over Interstate 505?

It is owned by the State Highway Agency.