US Bridges

Briceland RD CR435 over Mattole River

Fair

Mendocino County, California · 0.75 MI S Hum CO Line · Structure no. 10C0181

Built
1967
58 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
26
2011 count
Owner
County
County Highway Agency

About this bridge

Briceland RD CR435 over Mattole River is a steel stringer/multi-beam or girder carrying Briceland RD CR435 over Mattole River in Mendocino County, California. It was built in 1967, so it is 58 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 26 vehicles a day, roughly 3% of them trucks, projected to reach 41 by 2045. The structure is 51 ft (15.5 m) long and 17 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesBriceland RD CR435
CrossesMattole River
Location0.75 MI S Hum CO Line
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.99357, -123.92458
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating55.3 US tons
Inventory rating33.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length51 ft (15.5 m)
Longest span49 ft (14.9 m)
Deck width17 ft (5.2 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2011)
Projected traffic41 by 2045
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Briceland RD CR435 over Mattole River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Briceland RD CR435 over Mattole 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 July 2023.

How much traffic does Briceland RD CR435 over Mattole River carry?

About 26 vehicles per day (2011 count), of which roughly 3% are trucks.

How long is Briceland RD CR435 over Mattole River?

The structure is 51 ft (15.5 m) long with a longest span of 49 ft (14.9 m) and a deck 17 ft wide.

Who owns Briceland RD CR435 over Mattole River?

It is owned by the County Highway Agency.