US Bridges

Forwards Mill Road over N Fork Digger Creek

Fair

Tehama County, California · On Tehama/Shasta Cnty LN · Structure no. 08C0190

Built
1971
54 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
62 ft
2 main spans
Daily traffic
57
1989 count
Owner
County
County Highway Agency

About this bridge

Forwards Mill Road over N Fork Digger Creek is a concrete continuous slab carrying Forwards Mill Road over N Fork Digger Creek in Tehama County, California. It was built in 1971, so it is 54 years old, younger 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 57 vehicles a day, roughly 5% of them trucks, projected to reach 163 by 2041. The structure is 62 ft (18.9 m) long and 21 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesForwards Mill Road
CrossesN Fork Digger Creek
LocationOn Tehama/Shasta Cnty LN
RouteCounty Highway 0
Coordinates40.43564, -121.73485
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating92.2 US tons
Inventory rating55.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length62 ft (18.9 m)
Longest span30 ft (9.1 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic57 (1989)
Projected traffic163 by 2041
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Forwards Mill Road over N Fork Digger Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Forwards Mill Road over N Fork Digger 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 August 2023.

How much traffic does Forwards Mill Road over N Fork Digger Creek carry?

About 57 vehicles per day (1989 count), of which roughly 5% are trucks.

How long is Forwards Mill Road over N Fork Digger Creek?

The structure is 62 ft (18.9 m) long with a longest span of 30 ft (9.1 m) and a deck 21 ft wide.

Who owns Forwards Mill Road over N Fork Digger Creek?

It is owned by the County Highway Agency.