US Bridges

U.S. Highway 101 over Bridges Creek

Fair

Mendocino County, California · 01-MEN-101-97.47 · Structure no. 10 0033

Built
1980
45 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
145 ft
1 main span
Daily traffic
6,100
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Bridges Creek is a prestressed concrete box beam or girders - multiple carrying U.S. Highway 101 over Bridges Creek in Mendocino County, California. It was built in 1980, so it is 45 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 6,100 vehicles a day, roughly 15% of them trucks, projected to reach 7,549 by 2042. The structure is 145 ft (44.2 m) long and 36 ft wide. If it were closed, the detour would be 57.2 mi (92 km).

Location

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CarriesU.S. Highway 101
CrossesBridges Creek
Location01-MEN-101-97.47
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates39.90721, -123.75297
Functional classRural Principal Arterial - Other

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 protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.8 US tons
Inventory rating54.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length145 ft (44.2 m)
Longest span140 ft (42.8 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,100 (2009)
Projected traffic7,549 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed57.2 mi (92 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 U.S. Highway 101 over Bridges Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is U.S. Highway 101 over Bridges 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 April 2024.

How much traffic does U.S. Highway 101 over Bridges Creek carry?

About 6,100 vehicles per day (2009 count), of which roughly 15% are trucks.

How long is U.S. Highway 101 over Bridges Creek?

The structure is 145 ft (44.2 m) long with a longest span of 140 ft (42.8 m) and a deck 36 ft wide.

Who owns U.S. Highway 101 over Bridges Creek?

It is owned by the State Highway Agency.