US Bridges

Mountain House RD over Woodruff Creek

Fair

Sierra County, California · 0.5 MI S of Route 49 · Structure no. 13C0048

Built
1970
55 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
43 ft
1 main span
Daily traffic
110
1998 count
Owner
County
County Highway Agency

About this bridge

Mountain House RD over Woodruff Creek is a concrete tee beam carrying Mountain House RD over Woodruff Creek in Sierra County, California. It was built in 1970, so it is 55 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 110 vehicles a day, roughly 5% of them trucks, projected to reach 207 by 2041. The structure is 43 ft (13.1 m) long and 25 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesMountain House RD
CrossesWoodruff Creek
Location0.5 MI S of Route 49
RouteCounty Highway 0
CountySierra County
StateCalifornia
Coordinates39.5357, -120.88564
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating33.6 US tons
Inventory rating20.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length43 ft (13.1 m)
Longest span42 ft (12.8 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (1998)
Projected traffic207 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 Mountain House RD over Woodruff Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Mountain House RD over Woodruff 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 August 2023.

How much traffic does Mountain House RD over Woodruff Creek carry?

About 110 vehicles per day (1998 count), of which roughly 5% are trucks.

How long is Mountain House RD over Woodruff Creek?

The structure is 43 ft (13.1 m) long with a longest span of 42 ft (12.8 m) and a deck 25 ft wide.

Who owns Mountain House RD over Woodruff Creek?

It is owned by the County Highway Agency.