US Bridges

Salmon Creek Road over Salmon Creek

Fair

Humboldt County, California · 2 MI W/Of HWY 101 · Structure no. 04C0044

Built
1959
66 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
142 ft
2 main spans
Daily traffic
300
2011 count
Owner
County
County Highway Agency

About this bridge

Salmon Creek Road over Salmon Creek is a steel stringer/multi-beam or girder carrying Salmon Creek Road over Salmon Creek in Humboldt County, California. It was built in 1959, so it is 66 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 300 vehicles a day, roughly 2% of them trucks, projected to reach 327 by 2042. The structure is 142 ft (43.4 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSalmon Creek Road
CrossesSalmon Creek
Location2 MI W/Of HWY 101
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.22822, -123.86224
Functional classRural Local

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.
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 inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating95.3 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length142 ft (43.4 m)
Longest span68 ft (20.7 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2011)
Projected traffic327 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Salmon Creek Road over Salmon Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Salmon Creek Road over Salmon 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 February 2024.

How much traffic does Salmon Creek Road over Salmon Creek carry?

About 300 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Salmon Creek Road over Salmon Creek?

The structure is 142 ft (43.4 m) long with a longest span of 68 ft (20.7 m) and a deck 28 ft wide.

Who owns Salmon Creek Road over Salmon Creek?

It is owned by the County Highway Agency.