US Bridges

Table Mountain Blv over Thermalito Power Canal

Fair

Butte County, California · 0.8 MI NW Nelson Ave · Structure no. 12C0228

Built
1965
60 years old
Condition
Fair
inspected March 2025
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
270 ft
3 main spans
Daily traffic
3,312
2019 count
Owner
State
Other State Agency

About this bridge

Table Mountain Blv over Thermalito Power Canal is a concrete continuous box beam or girders - multiple carrying Table Mountain Blv over Thermalito Power Canal in Butte County, California. It was built in 1965, so it is 60 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 3,312 vehicles a day, roughly 3% of them trucks, projected to reach 5,563 by 2047. The structure is 270 ft (82.3 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesTable Mountain Blv
CrossesThermalito Power Canal
Location0.8 MI NW Nelson Ave
RouteCounty Highway 0
Coordinates39.53096, -121.56857
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.8 US tons
Inventory rating64.6 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length270 ft (82.3 m)
Longest span150 ft (45.7 m)
Deck width37 ft (11.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,312 (2019)
Projected traffic5,563 by 2047
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State Agency
Maintained byCity or Municipal 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 Table Mountain Blv over Thermalito Power Canal built?

It was built in 1965, making it 60 years old in 2025.

What condition is Table Mountain Blv over Thermalito Power Canal 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 2025.

How much traffic does Table Mountain Blv over Thermalito Power Canal carry?

About 3,312 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is Table Mountain Blv over Thermalito Power Canal?

The structure is 270 ft (82.3 m) long with a longest span of 150 ft (45.7 m) and a deck 37 ft wide.

Who owns Table Mountain Blv over Thermalito Power Canal?

It is owned by the Other State Agency and maintained by the City or Municipal Highway Agency.