US Bridges

Ramshorn Road over Mumbo Creek

Good

Trinity County, California · 9.6 MI East of SR 3 · Structure no. 05C0250

Built
2017
8 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
64 ft
1 main span
Daily traffic
15
2017 count
Owner
County
County Highway Agency

About this bridge

Ramshorn Road over Mumbo Creek is a steel stringer/multi-beam or girder carrying Ramshorn Road over Mumbo Creek in Trinity County, California. It was built in 2017, so it is 8 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, roughly 5% of them trucks, projected to reach 18 by 2042. The structure is 64 ft (19.5 m) long and 19 ft wide. If it were closed, the detour would be 91.3 mi (147 km).

CarriesRamshorn Road
CrossesMumbo Creek
Location9.6 MI East of SR 3
RouteCounty Highway 0
Coordinates41.13766, -122.57007
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length64 ft (19.5 m)
Longest span63 ft (19.1 m)
Deck width19 ft (5.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2017)
Projected traffic18 by 2042
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed91.3 mi (147 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 Ramshorn Road over Mumbo Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is Ramshorn Road over Mumbo Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does Ramshorn Road over Mumbo Creek carry?

About 15 vehicles per day (2017 count), of which roughly 5% are trucks.

How long is Ramshorn Road over Mumbo Creek?

The structure is 64 ft (19.5 m) long with a longest span of 63 ft (19.1 m) and a deck 19 ft wide.

Who owns Ramshorn Road over Mumbo Creek?

It is owned by the County Highway Agency.