US Bridges

Shower Pass RD over Olsen Creek

Fair

Humboldt County, California · 6.1 MI Ne/O Kneeland RD · Structure no. 04C0179

Built
1966
59 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
48 ft
1 main span
Daily traffic
7
2011 count
Owner
County
County Highway Agency

About this bridge

Shower Pass RD over Olsen Creek is a steel stringer/multi-beam or girder carrying Shower Pass RD over Olsen Creek in Humboldt County, California. It was built in 1966, so it is 59 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 7 vehicles a day, projected to reach 10 by 2043. The structure is 48 ft (14.7 m) long and 14 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesShower Pass RD
CrossesOlsen Creek
Location6.1 MI Ne/O Kneeland RD
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.57704, -123.76733
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length48 ft (14.7 m)
Longest span46 ft (14.1 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (3.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7 (2011)
Projected traffic10 by 2043
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 Shower Pass RD over Olsen Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Shower Pass RD over Olsen 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 June 2023.

How much traffic does Shower Pass RD over Olsen Creek carry?

About 7 vehicles per day (2011 count).

How long is Shower Pass RD over Olsen Creek?

The structure is 48 ft (14.7 m) long with a longest span of 46 ft (14.1 m) and a deck 14 ft wide.

Who owns Shower Pass RD over Olsen Creek?

It is owned by the County Highway Agency.