US Bridges

State Route 4 over Jackass Gulch

Good

Alpine County, California · 10-ALP-004-R7.82 · Structure no. 31 0008

Built
1982
43 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
175 ft
3 main spans
Daily traffic
1,250
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 4 over Jackass Gulch is a concrete continuous box beam or girders - multiple carrying State Route 4 over Jackass Gulch in Alpine County, California. It was built in 1982, so it is 43 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 1,250 vehicles a day, projected to reach 1,467 by 2041. The structure is 175 ft (53.3 m) long and 35 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesState Route 4
CrossesJackass Gulch
Location10-ALP-004-R7.82
RouteState Highway 4
CountyAlpine County
StateCalifornia
Coordinates38.50256, -119.95517
Functional classRural Minor Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating42.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length175 ft (53.3 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,250 (2009)
Projected traffic1,467 by 2041
Trucks0%
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

OwnerState Highway Agency
Maintained byState 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 State Route 4 over Jackass Gulch built?

It was built in 1982, making it 43 years old in 2025.

What condition is State Route 4 over Jackass Gulch 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 October 2023.

How much traffic does State Route 4 over Jackass Gulch carry?

About 1,250 vehicles per day (2009 count).

How long is State Route 4 over Jackass Gulch?

The structure is 175 ft (53.3 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns State Route 4 over Jackass Gulch?

It is owned by the State Highway Agency.