US Bridges

Elk Mountain Road over Middle Creek

Fair

Lake County, California · 5.08 MI N of SR 20 · Structure no. 14C0025

Built
1959
66 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Concrete Continuous
Length
179 ft
3 main spans
Daily traffic
175
2009 count
Owner
County
County Highway Agency

About this bridge

Elk Mountain Road over Middle Creek is a concrete continuous tee beam carrying Elk Mountain Road over Middle Creek in Lake County, California. It was built in 1959, so it is 66 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 175 vehicles a day, roughly 10% of them trucks, projected to reach 326 by 2046. The structure is 179 ft (54.7 m) long and 31 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesElk Mountain Road
CrossesMiddle Creek
Location5.08 MI N of SR 20
RouteCounty Highway 0
CountyLake County
StateCalifornia
Coordinates39.20794, -122.92613
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.7 m)
Longest span70 ft (21.3 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2009)
Projected traffic326 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Elk Mountain Road over Middle Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Elk Mountain Road over Middle 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 February 2024.

How much traffic does Elk Mountain Road over Middle Creek carry?

About 175 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is Elk Mountain Road over Middle Creek?

The structure is 179 ft (54.7 m) long with a longest span of 70 ft (21.3 m) and a deck 31 ft wide.

Who owns Elk Mountain Road over Middle Creek?

It is owned by the County Highway Agency.