US Bridges

Road 28N29 over Middle Fork Antelope

Fair

Tehama County, California · No Data Entered · Structure no. 050651000001010

Built
1954
71 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
20
Owner
Federal
U.S. Forest Service

About this bridge

Road 28N29 over Middle Fork Antelope is a steel stringer/multi-beam or girder carrying Road 28N29 over Middle Fork Antelope in Tehama County, California. It was built in 1954, so it is 71 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 20 vehicles a day, projected to reach 30 by 2045. The structure is 40 ft (12.2 m) long and 14 ft wide.

Location

Open in Google Maps
CarriesRoad 28N29
CrossesMiddle Fork Antelope
LocationNo Data Entered
RouteFederal Lands Road 28N29
CountyTehama County
StateCalifornia
Coordinates40.26724, -121.77454
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating22.5 US tons
Inventory rating17.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (—)
Projected traffic30 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 28N29 over Middle Fork Antelope built?

It was built in 1954, making it 71 years old in 2025.

What condition is Road 28N29 over Middle Fork Antelope 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 April 2024.

How much traffic does Road 28N29 over Middle Fork Antelope carry?

About 20 vehicles per day (latest count).

How long is Road 28N29 over Middle Fork Antelope?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 14 ft wide.

Who owns Road 28N29 over Middle Fork Antelope?

It is owned by the U.S. Forest Service.