US Bridges

Alder Lane over Sullivan Creek

Fair

Tuolumne County, California · 0.1 MI N Meadow Brook DR · Structure no. 32C0067

Built
1960
65 years old
Condition
Fair
inspected May 2024
Type
Truss - Deck
Steel
Length
56 ft
1 main span
Daily traffic
250
1991 count
Owner
County
County Highway Agency

About this bridge

Alder Lane over Sullivan Creek is a steel truss - deck carrying Alder Lane over Sullivan Creek in Tuolumne County, California. It was built in 1960, so it is 65 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 250 vehicles a day, roughly 1% of them trucks, projected to reach 332 by 2046. The structure is 56 ft (17.1 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesAlder Lane
CrossesSullivan Creek
Location0.1 MI N Meadow Brook DR
RouteCounty Highway 0
CountyTuolumne County
StateCalifornia
Coordinates37.99568, -120.33032
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating27.1 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span54 ft (16.5 m)
Deck width25 ft (7.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (1991)
Projected traffic332 by 2046
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Alder Lane over Sullivan Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Alder Lane over Sullivan Creek 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 May 2024.

How much traffic does Alder Lane over Sullivan Creek carry?

About 250 vehicles per day (1991 count), of which roughly 1% are trucks.

How long is Alder Lane over Sullivan Creek?

The structure is 56 ft (17.1 m) long with a longest span of 54 ft (16.5 m) and a deck 25 ft wide.

Who owns Alder Lane over Sullivan Creek?

It is owned by the County Highway Agency.