US Bridges

Hookton Road over Salmon Creek

Poor

Humboldt County, California · 0.1 MI W Eel River DR · Structure no. 04C0201

Built
1922
103 years old
Condition
Poor
inspected June 2023
Type
Tee Beam
Concrete Continuous
Length
39 ft
1 main span
Daily traffic
486
2011 count
Owner
County
County Highway Agency

About this bridge

Hookton Road over Salmon Creek is a concrete continuous tee beam carrying Hookton Road over Salmon Creek in Humboldt County, California. It was built in 1922, so it is 103 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 486 vehicles a day, roughly 2% of them trucks, projected to reach 745 by 2043. The structure is 39 ft (11.9 m) long and 19 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesHookton Road
CrossesSalmon Creek
Location0.1 MI W Eel River DR
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.66968, -124.20416
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span36 ft (11 m)
Deck width19 ft (5.7 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic486 (2011)
Projected traffic745 by 2043
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$114,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hookton Road over Salmon Creek built?

It was built in 1922, making it 103 years old in 2025.

What condition is Hookton Road over Salmon Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does Hookton Road over Salmon Creek carry?

About 486 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Hookton Road over Salmon Creek?

The structure is 39 ft (11.9 m) long with a longest span of 36 ft (11 m) and a deck 19 ft wide.

Who owns Hookton Road over Salmon Creek?

It is owned by the County Highway Agency.