US Bridges

Goat Mountain Road over Sullivan Creek

Fair

Colusa County, California · 4.9 MI W Lodoga-Stnyfd RD · Structure no. 15C0133

Built
1970
55 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
71 ft
1 main span
Daily traffic
16
2014 count
Owner
County
County Highway Agency

About this bridge

Goat Mountain Road over Sullivan Creek is a steel stringer/multi-beam or girder carrying Goat Mountain Road over Sullivan Creek in Colusa County, California. It was built in 1970, so it is 55 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 6 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 16 vehicles a day, roughly 1% of them trucks, projected to reach 64 by 2042. The structure is 71 ft (21.6 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesGoat Mountain Road
CrossesSullivan Creek
Location4.9 MI W Lodoga-Stnyfd RD
RouteCounty Highway 0
CountyColusa County
StateCalifornia
Coordinates39.27594, -122.5918
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span67 ft (20.4 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2014)
Projected traffic64 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Goat Mountain Road over Sullivan Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Goat Mountain Road over Sullivan 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 October 2024.

How much traffic does Goat Mountain Road over Sullivan Creek carry?

About 16 vehicles per day (2014 count), of which roughly 1% are trucks.

How long is Goat Mountain Road over Sullivan Creek?

The structure is 71 ft (21.6 m) long with a longest span of 67 ft (20.4 m) and a deck 20 ft wide.

Who owns Goat Mountain Road over Sullivan Creek?

It is owned by the County Highway Agency.