US Bridges

Turner Island RD over Salt Slough

Fair

Merced County, California · 3.1 MI N Henry Miller Ave · Structure no. 39C0304

Built
1975
50 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
81 ft
3 main spans
Daily traffic
500
1990 count
Owner
County
County Highway Agency

About this bridge

Turner Island RD over Salt Slough is a concrete continuous slab carrying Turner Island RD over Salt Slough in Merced County, California. It was built in 1975, so it is 50 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 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 500 vehicles a day, roughly 3% of them trucks, projected to reach 1,171 by 2042. The structure is 81 ft (24.7 m) long and 32 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

CarriesTurner Island RD
CrossesSalt Slough
Location3.1 MI N Henry Miller Ave
RouteCounty Highway 0
Coordinates37.14072, -120.70702
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.9 US tons
Inventory rating56.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span26 ft (7.9 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (1990)
Projected traffic1,171 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 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 Turner Island RD over Salt Slough built?

It was built in 1975, making it 50 years old in 2025.

What condition is Turner Island RD over Salt Slough 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 November 2024.

How much traffic does Turner Island RD over Salt Slough carry?

About 500 vehicles per day (1990 count), of which roughly 3% are trucks.

How long is Turner Island RD over Salt Slough?

The structure is 81 ft (24.7 m) long with a longest span of 26 ft (7.9 m) and a deck 32 ft wide.

Who owns Turner Island RD over Salt Slough?

It is owned by the County Highway Agency.