US Bridges

Elk Mountain RD over Soda Creek

Poor

Lake County, California · Simmons RD in Hullville · Structure no. 14C0089

Built
1979
46 years old
Condition
Poor
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
169
2009 count
Owner
County
County Highway Agency

About this bridge

Elk Mountain RD over Soda Creek is a steel stringer/multi-beam or girder carrying Elk Mountain RD over Soda Creek in Lake 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 169 vehicles a day, roughly 5% of them trucks, projected to reach 261 by 2046. The structure is 51 ft (15.5 m) long and 30 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesElk Mountain RD
CrossesSoda Creek
LocationSimmons RD in Hullville
RouteCounty Highway 0
Coordinates39.41994, -122.97918
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length51 ft (15.5 m)
Longest span49 ft (14.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic169 (2009)
Projected traffic261 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$236,000 (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Elk Mountain RD over Soda Creek built?

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

What condition is Elk Mountain RD over Soda Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does Elk Mountain RD over Soda Creek carry?

About 169 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is Elk Mountain RD over Soda Creek?

The structure is 51 ft (15.5 m) long with a longest span of 49 ft (14.9 m) and a deck 30 ft wide.

Who owns Elk Mountain RD over Soda Creek?

It is owned by the County Highway Agency.