US Bridges

Rock River Road over Dry Creek

Fair

Tuolumne County, California · 2 MI S Green Springs RD · Structure no. 32C0019

Built
1937
88 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
75
2015 count
Owner
County
County Highway Agency

About this bridge

Rock River Road over Dry Creek is a concrete tee beam carrying Rock River Road over Dry Creek in Tuolumne County, California. It was built in 1937, so it is 88 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 75 vehicles a day, roughly 1% of them trucks, projected to reach 300 by 2041. The structure is 44 ft (13.4 m) long and 23 ft wide. If it were closed, the detour would be 23 mi (37 km).

CarriesRock River Road
CrossesDry Creek
Location2 MI S Green Springs RD
RouteCounty Highway 0
Coordinates37.82434, -120.54036
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
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating34.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2015)
Projected traffic300 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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 Rock River Road over Dry Creek built?

It was built in 1937, making it 88 years old in 2025.

What condition is Rock River Road over Dry 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 July 2023.

How much traffic does Rock River Road over Dry Creek carry?

About 75 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Rock River Road over Dry Creek?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 23 ft wide.

Who owns Rock River Road over Dry Creek?

It is owned by the County Highway Agency.