US Bridges

State Route 299 over Ramp Road

Fair

Humboldt County, California · 01-HUM-299-R4.04 · Structure no. 04 0191

Built
1965
60 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete Continuous
Length
119 ft
3 main spans
Daily traffic
9,700
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 299 over Ramp Road is a concrete continuous tee beam carrying State Route 299 over Ramp Road in Humboldt County, California. It was built in 1965, so it is 60 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 9,700 vehicles a day, roughly 17% of them trucks, projected to reach 13,909 by 2045. The structure is 119 ft (36.3 m) long and 88 ft wide.

Location

Open in Google Maps
CarriesState Route 299
CrossesRamp Road
Location01-HUM-299-R4.04
RouteState Highway 299
CountyHumboldt County
StateCalifornia
Coordinates40.89816, -124.02093
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.6 US tons
Inventory rating26.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length119 ft (36.3 m)
Longest span49 ft (14.9 m)
Deck width88 ft (26.9 m)
Roadway width87 ft (26.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,700 (2009)
Projected traffic13,909 by 2045
Trucks17%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 299 over Ramp Road built?

It was built in 1965, making it 60 years old in 2025.

What condition is State Route 299 over Ramp Road 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 Ramp Road carry?

About 9,700 vehicles per day (2009 count), of which roughly 17% are trucks.

How long is State Route 299 over Ramp Road?

The structure is 119 ft (36.3 m) long with a longest span of 49 ft (14.9 m) and a deck 88 ft wide.

Who owns State Route 299 over Ramp Road?

It is owned by the State Highway Agency.