US Bridges

U.S. Highway 101 over Outlet Creek

Fair

Mendocino County, California · 01-MEN-101-50.66 · Structure no. 10 0016

Built
1979
46 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
366 ft
6 main spans
Daily traffic
6,950
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Outlet Creek is a concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over Outlet Creek in Mendocino County, California. It was built in 1979, so it is 46 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 6,950 vehicles a day, projected to reach 9,662 by 2045. The structure is 366 ft (111.6 m) long and 44 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesU.S. Highway 101
CrossesOutlet Creek
Location01-MEN-101-50.66
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates39.46237, -123.35014
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
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length366 ft (111.6 m)
Longest span66 ft (20.1 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,950 (2009)
Projected traffic9,662 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Outlet Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is U.S. Highway 101 over Outlet 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 May 2023.

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

About 6,950 vehicles per day (2009 count).

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

The structure is 366 ft (111.6 m) long with a longest span of 66 ft (20.1 m) and a deck 44 ft wide.

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

It is owned by the State Highway Agency.