US Bridges

Port Kenyon Road over Salt River Overflow

Good

Humboldt County, California · 0.24 MI W Highway 211 · Structure no. 04C0122

Built
1962
63 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
114 ft
4 main spans
Daily traffic
351
2014 count
Owner
County
County Highway Agency

About this bridge

Port Kenyon Road over Salt River Overflow is a concrete continuous slab carrying Port Kenyon Road over Salt River Overflow in Humboldt County, California. It was built in 1962, so it is 63 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 351 vehicles a day, roughly 4% of them trucks, projected to reach 481 by 2041. The structure is 114 ft (34.8 m) long and 35 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesPort Kenyon Road
CrossesSalt River Overflow
Location0.24 MI W Highway 211
RouteCounty Highway 0
Coordinates40.59472, -124.254
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.7 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length114 ft (34.8 m)
Longest span32 ft (9.8 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic351 (2014)
Projected traffic481 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Port Kenyon Road over Salt River Overflow built?

It was built in 1962, making it 63 years old in 2025.

What condition is Port Kenyon Road over Salt River Overflow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Port Kenyon Road over Salt River Overflow carry?

About 351 vehicles per day (2014 count), of which roughly 4% are trucks.

How long is Port Kenyon Road over Salt River Overflow?

The structure is 114 ft (34.8 m) long with a longest span of 32 ft (9.8 m) and a deck 35 ft wide.

Who owns Port Kenyon Road over Salt River Overflow?

It is owned by the County Highway Agency.