US Bridges

State Route 299 over Caldwell Creek

Good

Modoc County, California · 02-MOD-299-23.34 · Structure no. 03 0062

Built
2019
6 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
43 ft
1 main span
Daily traffic
1,350
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Caldwell Creek is a concrete continuous slab carrying State Route 299 over Caldwell Creek in Modoc County, California. It was built in 2019, so it is 6 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 1,350 vehicles a day, roughly 22% of them trucks, projected to reach 1,525 by 2040. The structure is 43 ft (13 m) long and 43 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesState Route 299
CrossesCaldwell Creek
Location02-MOD-299-23.34
RouteState Highway 299
Coordinates41.45058, -120.85342
Functional classRural Principal Arterial - Other

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length43 ft (13 m)
Longest span40 ft (12.2 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,350 (2015)
Projected traffic1,525 by 2040
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemYes

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 299 over Caldwell Creek built?

It was built in 2019, making it 6 years old in 2025.

What condition is State Route 299 over Caldwell 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 Caldwell Creek carry?

About 1,350 vehicles per day (2015 count), of which roughly 22% are trucks.

How long is State Route 299 over Caldwell Creek?

The structure is 43 ft (13 m) long with a longest span of 40 ft (12.2 m) and a deck 43 ft wide.

Who owns State Route 299 over Caldwell Creek?

It is owned by the State Highway Agency.