US Bridges

Browns Mountain RD over Trinity River

Fair

Trinity County, California · 0.3 MI W Lewiston RD · Structure no. 05C0207

Built
1983
42 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
76 ft
1 main span
Daily traffic
200
2010 count
Owner
County
County Highway Agency

About this bridge

Browns Mountain RD over Trinity River is a steel stringer/multi-beam or girder carrying Browns Mountain RD over Trinity River in Trinity County, California. It was built in 1983, so it is 42 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 200 vehicles a day, roughly 2% of them trucks, projected to reach 320 by 2042. The structure is 76 ft (23.1 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesBrowns Mountain RD
CrossesTrinity River
Location0.3 MI W Lewiston RD
RouteCounty Highway 0
CountyTrinity County
StateCalifornia
Coordinates40.70419, -122.84679
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating81 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length76 ft (23.1 m)
Longest span74 ft (22.5 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2010)
Projected traffic320 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-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 Browns Mountain RD over Trinity River built?

It was built in 1983, making it 42 years old in 2025.

What condition is Browns Mountain RD over Trinity 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 August 2023.

How much traffic does Browns Mountain RD over Trinity River carry?

About 200 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is Browns Mountain RD over Trinity River?

The structure is 76 ft (23.1 m) long with a longest span of 74 ft (22.5 m) and a deck 32 ft wide.

Who owns Browns Mountain RD over Trinity River?

It is owned by the County Highway Agency.