US Bridges

Orr Springs RD over Ackerman Creek

Fair

Mendocino County, California · 2.0 MI W US 101 · Structure no. 10C0159

Built
1956
69 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Concrete
Length
82 ft
2 main spans
Daily traffic
3,101
2011 count
Owner
County
County Highway Agency

About this bridge

Orr Springs RD over Ackerman Creek is a concrete tee beam carrying Orr Springs RD over Ackerman Creek in Mendocino County, California. It was built in 1956, so it is 69 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 3,101 vehicles a day, roughly 10% of them trucks, projected to reach 3,229 by 2046. The structure is 82 ft (25.1 m) long and 28 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesOrr Springs RD
CrossesAckerman Creek
Location2.0 MI W US 101
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.18067, -123.23398
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating45 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length82 ft (25.1 m)
Longest span38 ft (11.7 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,101 (2011)
Projected traffic3,229 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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 Orr Springs RD over Ackerman Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Orr Springs RD over Ackerman 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 February 2024.

How much traffic does Orr Springs RD over Ackerman Creek carry?

About 3,101 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Orr Springs RD over Ackerman Creek?

The structure is 82 ft (25.1 m) long with a longest span of 38 ft (11.7 m) and a deck 28 ft wide.

Who owns Orr Springs RD over Ackerman Creek?

It is owned by the County Highway Agency.