US Bridges

State Route 283 over Eel River & Nwp RR

Fair

Humboldt County, California · 01-HUM-283-0.12 · Structure no. 04 0015

Built
1941
84 years old
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel Continuous
Length
1,196 ft
3 main spans
Daily traffic
2,150
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 283 over Eel River & Nwp RR is a steel continuous truss - thru carrying State Route 283 over Eel River & Nwp RR in Humboldt County, California. It was built in 1941, so it is 84 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 2,150 vehicles a day, roughly 4% of them trucks, projected to reach 4,934 by 2041. The structure is 1,196 ft (364.5 m) long and 40 ft wide. If it were closed, the detour would be 34.2 mi (55 km).

Location

Open in Google Maps
CarriesState Route 283
CrossesEel River & Nwp RR
Location01-HUM-283-0.12
RouteState Highway 283
CountyHumboldt County
StateCalifornia
Coordinates40.48969, -124.09915
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.5 US tons
Inventory rating22.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+9 approach)
Design loadHS 20
Structure length1,196 ft (364.5 m)
Longest span322 ft (98.1 m)
Deck width40 ft (12.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic2,150 (2009)
Projected traffic4,934 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
Detour if closed34.2 mi (55 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 283 over Eel River & Nwp RR built?

It was built in 1941, making it 84 years old in 2025.

What condition is State Route 283 over Eel River & Nwp RR 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 July 2023.

How much traffic does State Route 283 over Eel River & Nwp RR carry?

About 2,150 vehicles per day (2009 count), of which roughly 4% are trucks.

How long is State Route 283 over Eel River & Nwp RR?

The structure is 1,196 ft (364.5 m) long with a longest span of 322 ft (98.1 m) and a deck 40 ft wide.

Who owns State Route 283 over Eel River & Nwp RR?

It is owned by the State Highway Agency.