US Bridges

State Route 299 over Hat Creek

Fair

Shasta County, California · 02-SHA-299-84.02 · Structure no. 06 0066

Built
1933
92 years old, rebuilt 1987
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
115 ft
3 main spans
Daily traffic
3,200
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Hat Creek is a steel stringer/multi-beam or girder carrying State Route 299 over Hat Creek in Shasta County, California. It was built in 1933 and reconstructed in 1987, so it is 92 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 3,200 vehicles a day, roughly 13% of them trucks, projected to reach 5,290 by 2042. The structure is 115 ft (35.2 m) long and 44 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesState Route 299
CrossesHat Creek
Location02-SHA-299-84.02
RouteState Highway 299
CountyShasta County
StateCalifornia
Coordinates40.97659, -121.55664
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.8 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length115 ft (35.2 m)
Longest span38 ft (11.6 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2020)
Projected traffic5,290 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 299 over Hat Creek built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1987.

What condition is State Route 299 over Hat Creek 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 April 2023.

How much traffic does State Route 299 over Hat Creek carry?

About 3,200 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is State Route 299 over Hat Creek?

The structure is 115 ft (35.2 m) long with a longest span of 38 ft (11.6 m) and a deck 44 ft wide.

Who owns State Route 299 over Hat Creek?

It is owned by the State Highway Agency.