US Bridges

Davison Road over Prairie Creek

Fair

Humboldt County, California · Approximately 0.2 Miles F · Structure no. 8480017P0000000

Built
1970
55 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
102 ft
1 main span
Daily traffic
50
2019 count
Owner
County
County Highway Agency

About this bridge

Davison Road over Prairie Creek is a prestressed concrete box beam or girders - single or spread carrying Davison Road over Prairie Creek in Humboldt County, California. It was built in 1970, so it is 55 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 6 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 50 vehicles a day, projected to reach 60 by 2039. The structure is 102 ft (31.1 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDavison Road
CrossesPrairie Creek
LocationApproximately 0.2 Miles F
RouteFederal Lands Road 0
CountyHumboldt County
StateCalifornia
Coordinates41.32208, -124.04272
Functional classRural Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length102 ft (31.1 m)
Longest span102 ft (31.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2019)
Projected traffic60 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$26,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Davison Road over Prairie Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Davison Road over Prairie 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 July 2024.

How much traffic does Davison Road over Prairie Creek carry?

About 50 vehicles per day (2019 count).

How long is Davison Road over Prairie Creek?

The structure is 102 ft (31.1 m) long with a longest span of 102 ft (31.1 m) and a deck 28 ft wide.

Who owns Davison Road over Prairie Creek?

It is owned by the County Highway Agency and maintained by the National Park Service.