US Bridges

State Route 299 over North Fork Ash Creek

Good

Modoc County, California · 02-MOD-299-3.38 · Structure no. 03 0060

Built
2012
13 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete
Length
46 ft
1 main span
Daily traffic
1,110
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over North Fork Ash Creek is a concrete slab carrying State Route 299 over North Fork Ash Creek in Modoc County, California. It was built in 2012, so it is 13 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 1,110 vehicles a day, roughly 11% of them trucks, projected to reach 1,300 by 2040. The structure is 46 ft (14 m) long and 43 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesState Route 299
CrossesNorth Fork Ash Creek
Location02-MOD-299-3.38
RouteState Highway 299
Coordinates41.22617, -120.92292
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length46 ft (14 m)
Longest span46 ft (14 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,110 (2015)
Projected traffic1,300 by 2040
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5.6 mi (9 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 299 over North Fork Ash Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is State Route 299 over North Fork Ash Creek 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 State Route 299 over North Fork Ash Creek carry?

About 1,110 vehicles per day (2015 count), of which roughly 11% are trucks.

How long is State Route 299 over North Fork Ash Creek?

The structure is 46 ft (14 m) long with a longest span of 46 ft (14 m) and a deck 43 ft wide.

Who owns State Route 299 over North Fork Ash Creek?

It is owned by the State Highway Agency.