US Bridges

IRR BIA RTE 18 over Pine Creek

Fair

Humboldt County, California · 1.5KM S Martin Ferry Bd. · Structure no. 00000000000J140

Built
1977
48 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
122 ft
2 main spans
Daily traffic
40
2021 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 18 over Pine Creek is a prestressed concrete tee beam carrying IRR BIA RTE 18 over Pine Creek in Humboldt County, California. It was built in 1977, so it is 48 years old, younger 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 50 by 2043. The structure is 122 ft (37.3 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIRR BIA RTE 18
CrossesPine Creek
Location1.5KM S Martin Ferry Bd.
RouteFederal Lands Road 18
CountyHumboldt County
StateCalifornia
Coordinates41.19369, -123.75472
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating35.9 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length122 ft (37.3 m)
Longest span64 ft (19.4 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2021)
Projected traffic50 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$342,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE 18 over Pine Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is IRR BIA RTE 18 over Pine 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 October 2023.

How much traffic does IRR BIA RTE 18 over Pine Creek carry?

About 40 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is IRR BIA RTE 18 over Pine Creek?

The structure is 122 ft (37.3 m) long with a longest span of 64 ft (19.4 m) and a deck 24 ft wide.

Who owns IRR BIA RTE 18 over Pine Creek?

It is owned by the Bureau of Indian Affairs.