US Bridges

Mountain House RD over North Fork Yuba River

Fair

Sierra County, California · 0.15 MI South of SR 49 · Structure no. 13C0007

Built
1936
89 years old, rebuilt 2000
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel
Length
218 ft
1 main span
Daily traffic
100
2000 count
Owner
County
County Highway Agency

About this bridge

Mountain House RD over North Fork Yuba River is a steel truss - thru carrying Mountain House RD over North Fork Yuba River in Sierra County, California. It was built in 1936 and reconstructed in 2000, so it is 89 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 156 by 2042. The structure is 218 ft (66.4 m) long and 13 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesMountain House RD
CrossesNorth Fork Yuba River
Location0.15 MI South of SR 49
RouteCounty Highway 0
CountySierra County
StateCalifornia
Coordinates39.54062, -120.8859
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating44 US tons
Inventory rating26.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1 (+3 approach)
Design loadHS 20 + Mod
Structure length218 ft (66.4 m)
Longest span101 ft (30.9 m)
Deck width13 ft (3.9 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2000)
Projected traffic156 by 2042
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 North Fork Yuba River built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2000.

What condition is Mountain House RD over North Fork Yuba River 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 2024.

How much traffic does Mountain House RD over North Fork Yuba River carry?

About 100 vehicles per day (2000 count), of which roughly 3% are trucks.

How long is Mountain House RD over North Fork Yuba River?

The structure is 218 ft (66.4 m) long with a longest span of 101 ft (30.9 m) and a deck 13 ft wide.

Who owns Mountain House RD over North Fork Yuba River?

It is owned by the County Highway Agency.