US Bridges

Zanes RD over Elk River

Fair

Humboldt County, California · 0.1 MI W Elk River RD · Structure no. 04C0048

Built
1936
89 years old
Condition
Fair
inspected June 2023
Type
Truss - Thru
Wood or Timber
Length
125 ft
1 main span
Daily traffic
38
2011 count
Owner
County
County Highway Agency

About this bridge

Zanes RD over Elk River is a wood or timber truss - thru carrying Zanes RD over Elk River in Humboldt County, California. It was built in 1936, so it is 89 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 38 vehicles a day, roughly 2% of them trucks, projected to reach 58 by 2043. The structure is 125 ft (38.2 m) long and 15 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesZanes RD
CrossesElk River
Location0.1 MI W Elk River RD
RouteCounty Highway 0
CountyHumboldt County
StateCalifornia
Coordinates40.71792, -124.16899
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating31.7 US tons
Inventory rating19.3 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans1 (+4 approach)
Design loadUnknown
Structure length125 ft (38.2 m)
Longest span52 ft (15.9 m)
Deck width15 ft (4.7 m)
Roadway width11 ft (3.3 m)
Vertical clearance over deck14 ft (4.2 m)

Traffic and service

Average daily traffic38 (2011)
Projected traffic58 by 2043
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Zanes RD over Elk River built?

It was built in 1936, making it 89 years old in 2025.

What condition is Zanes RD over Elk 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 June 2023.

How much traffic does Zanes RD over Elk River carry?

About 38 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Zanes RD over Elk River?

The structure is 125 ft (38.2 m) long with a longest span of 52 ft (15.9 m) and a deck 15 ft wide.

Who owns Zanes RD over Elk River?

It is owned by the County Highway Agency.