US Bridges

Wilbur RD over Thermalito Bay Connect

Fair

Butte County, California · 0.25 MI N of SR 162 · Structure no. 12C0370

Built
1966
59 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete Continuous
Length
265 ft
4 main spans
Daily traffic
65
2019 count
Owner
State
Other State Agency

About this bridge

Wilbur RD over Thermalito Bay Connect is a concrete continuous tee beam carrying Wilbur RD over Thermalito Bay Connect in Butte County, California. It was built in 1966, so it is 59 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 5 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 65 vehicles a day, roughly 15% of them trucks, projected to reach 106 by 2044. The structure is 265 ft (80.8 m) long and 37 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesWilbur RD
CrossesThermalito Bay Connect
Location0.25 MI N of SR 162
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.5006, -121.65072
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length265 ft (80.8 m)
Longest span66 ft (20.2 m)
Deck width37 ft (11.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2019)
Projected traffic106 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State 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 Wilbur RD over Thermalito Bay Connect built?

It was built in 1966, making it 59 years old in 2025.

What condition is Wilbur RD over Thermalito Bay Connect 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 January 2025.

How much traffic does Wilbur RD over Thermalito Bay Connect carry?

About 65 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is Wilbur RD over Thermalito Bay Connect?

The structure is 265 ft (80.8 m) long with a longest span of 66 ft (20.2 m) and a deck 37 ft wide.

Who owns Wilbur RD over Thermalito Bay Connect?

It is owned by the Other State Agency and maintained by the County Highway Agency.