US Bridges

State Route 299 over Gray Creek

Fair

Trinity County, California · 02-TRI-299-6.33 · Structure no. 05 0044

Built
1966
59 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
224 ft
2 main spans
Daily traffic
3,800
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Gray Creek is a steel continuous stringer/multi-beam or girder carrying State Route 299 over Gray Creek in Trinity County, California. It was built in 1966, so it is 59 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 3,800 vehicles a day, projected to reach 4,459 by 2045. The structure is 224 ft (68.4 m) long and 34 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesState Route 299
CrossesGray Creek
Location02-TRI-299-6.33
RouteState Highway 299
CountyTrinity County
StateCalifornia
Coordinates40.86012, -123.51189
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length224 ft (68.4 m)
Longest span111 ft (33.8 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2009)
Projected traffic4,459 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Gray Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is State Route 299 over Gray 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 January 2025.

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

About 3,800 vehicles per day (2009 count).

How long is State Route 299 over Gray Creek?

The structure is 224 ft (68.4 m) long with a longest span of 111 ft (33.8 m) and a deck 34 ft wide.

Who owns State Route 299 over Gray Creek?

It is owned by the State Highway Agency.