US Bridges

Ishi Pishi RD over Klamath River

Fair

Humboldt County, California · 0.5 MI SW of SR 96 · Structure no. 04C0236

Built
1967
58 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
664 ft
3 main spans
Daily traffic
71
2011 count
Owner
County
County Highway Agency

About this bridge

Ishi Pishi RD over Klamath River is a steel continuous stringer/multi-beam or girder carrying Ishi Pishi RD over Klamath River in Humboldt County, California. It was built in 1967, so it is 58 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 71 vehicles a day, roughly 1% of them trucks, projected to reach 102 by 2041. The structure is 664 ft (202.4 m) long and 31 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIshi Pishi RD
CrossesKlamath River
Location0.5 MI SW of SR 96
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates41.3768, -123.49464
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating23.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadHS 20
Structure length664 ft (202.4 m)
Longest span258 ft (78.6 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2011)
Projected traffic102 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Ishi Pishi RD over Klamath River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Ishi Pishi RD over Klamath River 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 October 2023.

How much traffic does Ishi Pishi RD over Klamath River carry?

About 71 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Ishi Pishi RD over Klamath River?

The structure is 664 ft (202.4 m) long with a longest span of 258 ft (78.6 m) and a deck 31 ft wide.

Who owns Ishi Pishi RD over Klamath River?

It is owned by the County Highway Agency.