US Bridges

State Route 1 over Elk Creek

Fair

Mendocino County, California · 01-MEN-001-31.35 · Structure no. 10 0120

Built
1938
87 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
1,100
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Elk Creek is a concrete continuous tee beam carrying State Route 1 over Elk Creek in Mendocino County, California. It was built in 1938, so it is 87 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 1,100 vehicles a day, roughly 10% of them trucks, projected to reach 2,125 by 2042. The structure is 122 ft (37.2 m) long and 31 ft wide. If it were closed, the detour would be 47.2 mi (76 km).

CarriesState Route 1
CrossesElk Creek
Location01-MEN-001-31.35
RouteState Highway 1
Coordinates39.10186, -123.7016
Functional classRural Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionAugust 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length122 ft (37.2 m)
Longest span50 ft (15.2 m)
Deck width31 ft (9.3 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2009)
Projected traffic2,125 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.2 mi (76 km)
TollOn a free road
National Highway SystemNo

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 State Route 1 over Elk Creek built?

It was built in 1938, making it 87 years old in 2025.

What condition is State Route 1 over Elk 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 August 2024.

How much traffic does State Route 1 over Elk Creek carry?

About 1,100 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is State Route 1 over Elk Creek?

The structure is 122 ft (37.2 m) long with a longest span of 50 ft (15.2 m) and a deck 31 ft wide.

Who owns State Route 1 over Elk Creek?

It is owned by the State Highway Agency.