US Bridges

Turntable Bay Road over Interstate 5 NB

Fair

Shasta County, California · 02-SHA-005-R29.32R · Structure no. 06 0130R

Built
1968
57 years old, rebuilt 2016
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
131 ft
1 main span
Daily traffic
400
1998 count
Owner
State
State Highway Agency

About this bridge

Turntable Bay Road over Interstate 5 NB is a prestressed concrete box beam or girders - multiple carrying Turntable Bay Road over Interstate 5 NB in Shasta County, California. It was built in 1968 and reconstructed in 2016, so it is 57 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 400 vehicles a day, roughly 4% of them trucks, projected to reach 1,600 by 2042. The structure is 131 ft (39.9 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesTurntable Bay Road
CrossesInterstate 5 NB
Location02-SHA-005-R29.32R
RouteCounty Highway 0
Coordinates40.77277, -122.31264
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.9 US tons
Inventory rating22.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length131 ft (39.9 m)
Longest span128 ft (39.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (1998)
Projected traffic1,600 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 Turntable Bay Road over Interstate 5 NB built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2016.

What condition is Turntable Bay Road over Interstate 5 NB 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 Turntable Bay Road over Interstate 5 NB carry?

About 400 vehicles per day (1998 count), of which roughly 4% are trucks.

How long is Turntable Bay Road over Interstate 5 NB?

The structure is 131 ft (39.9 m) long with a longest span of 128 ft (39.1 m) and a deck 35 ft wide.

Who owns Turntable Bay Road over Interstate 5 NB?

It is owned by the State Highway Agency.