US Bridges

N State ST over Ackerman Creek

Fair

Mendocino County, California · 0.2 MI N Orr Springs RD · Structure no. 10C0065

Built
1965
60 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
148 ft
3 main spans
Daily traffic
15,534
2011 count
Owner
County
County Highway Agency

About this bridge

N State ST over Ackerman Creek is a concrete continuous slab carrying N State ST over Ackerman Creek in Mendocino County, California. It was built in 1965, so it is 60 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 5 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 15,534 vehicles a day, roughly 5% of them trucks, projected to reach 11,423 by 2044. The structure is 148 ft (45 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesN State ST
CrossesAckerman Creek
Location0.2 MI N Orr Springs RD
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.17903, -123.20998
Functional classRural Major Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.4 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length148 ft (45 m)
Longest span49 ft (14.9 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,534 (2011)
Projected traffic11,423 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 N State ST over Ackerman Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is N State ST 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 N State ST over Ackerman Creek carry?

About 15,534 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is N State ST over Ackerman Creek?

The structure is 148 ft (45 m) long with a longest span of 49 ft (14.9 m) and a deck 34 ft wide.

Who owns N State ST over Ackerman Creek?

It is owned by the County Highway Agency.