US Bridges

Henness Pass Road over Little Truckee River

Good

Sierra County, California · 3 MI East of Webber Lake · Structure no. 13C0057

Built
2002
23 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
89 ft
1 main span
Daily traffic
340
1997 count
Owner
County
County Highway Agency

About this bridge

Henness Pass Road over Little Truckee River is a prestressed concrete box beam or girders - single or spread carrying Henness Pass Road over Little Truckee River in Sierra County, California. It was built in 2002, so it is 23 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 340 vehicles a day, roughly 3% of them trucks, projected to reach 435 by 2045. The structure is 89 ft (27 m) long and 17 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesHenness Pass Road
CrossesLittle Truckee River
Location3 MI East of Webber Lake
RouteCounty Highway 0
Coordinates39.48615, -120.371
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length89 ft (27 m)
Longest span87 ft (26.5 m)
Deck width17 ft (5.1 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (1997)
Projected traffic435 by 2045
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Henness Pass Road over Little Truckee River built?

It was built in 2002, making it 23 years old in 2025.

What condition is Henness Pass Road over Little Truckee River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Henness Pass Road over Little Truckee River carry?

About 340 vehicles per day (1997 count), of which roughly 3% are trucks.

How long is Henness Pass Road over Little Truckee River?

The structure is 89 ft (27 m) long with a longest span of 87 ft (26.5 m) and a deck 17 ft wide.

Who owns Henness Pass Road over Little Truckee River?

It is owned by the County Highway Agency.