US Bridges

Crooked Lane over State Route 108

Fair

Tuolumne County, California · 10-TUO-108-R0.65-SRA · Structure no. 32 0064

Built
1987
38 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
121 ft
1 main span
Daily traffic
1,000
1998 count
Owner
State
State Highway Agency

About this bridge

Crooked Lane over State Route 108 is a prestressed concrete box beam or girders - multiple carrying Crooked Lane over State Route 108 in Tuolumne County, California. It was built in 1987, so it is 38 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 1,000 vehicles a day, roughly 5% of them trucks, projected to reach 3,218 by 2041. The structure is 121 ft (36.9 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCrooked Lane
CrossesState Route 108
Location10-TUO-108-R0.65-SRA
RouteCity Street 0
CountyTuolumne County
StateCalifornia
Coordinates37.96564, -120.38239
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length121 ft (36.9 m)
Longest span121 ft (36.9 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (1998)
Projected traffic3,218 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 Crooked Lane over State Route 108 built?

It was built in 1987, making it 38 years old in 2025.

What condition is Crooked Lane over State Route 108 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 September 2023.

How much traffic does Crooked Lane over State Route 108 carry?

About 1,000 vehicles per day (1998 count), of which roughly 5% are trucks.

How long is Crooked Lane over State Route 108?

The structure is 121 ft (36.9 m) long with a longest span of 121 ft (36.9 m) and a deck 31 ft wide.

Who owns Crooked Lane over State Route 108?

It is owned by the State Highway Agency.