US Bridges

Berta RD over Elk River

Fair

Humboldt County, California · 0.14 MI W Elk River RD · Structure no. 04C0047

Built
1936
89 years old
Condition
Fair
inspected June 2023
Type
Truss - Thru
Wood or Timber
Length
128 ft
1 main span
Daily traffic
518
2011 count
Owner
County
County Highway Agency

About this bridge

Berta RD over Elk River is a wood or timber truss - thru carrying Berta 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 518 vehicles a day, roughly 2% of them trucks, projected to reach 810 by 2043. The structure is 128 ft (39.1 m) long and 13 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesBerta RD
CrossesElk River
Location0.14 MI W Elk River RD
RouteCounty Highway 0
Coordinates40.72453, -124.1772
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 protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating19.6 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans1 (+4 approach)
Design loadUnknown
Structure length128 ft (39.1 m)
Longest span52 ft (15.9 m)
Deck width13 ft (3.9 m)
Roadway width10 ft (3.2 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic518 (2011)
Projected traffic810 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 Berta RD over Elk River built?

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

What condition is Berta 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 Berta RD over Elk River carry?

About 518 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Berta RD over Elk River?

The structure is 128 ft (39.1 m) long with a longest span of 52 ft (15.9 m) and a deck 13 ft wide.

Who owns Berta RD over Elk River?

It is owned by the County Highway Agency.