US Bridges

Road 9 over Ash Slough

Fair

Madera County, California · 0.15 MI N of Ave 221/2 · Structure no. 41C0100

Built
1967
58 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
302 ft
10 main spans
Daily traffic
282
2020 count
Owner
County
County Highway Agency

About this bridge

Road 9 over Ash Slough is a concrete continuous slab carrying Road 9 over Ash Slough in Madera County, California. It was built in 1967, so it is 58 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 282 vehicles a day, roughly 20% of them trucks, projected to reach 657 by 2042. The structure is 302 ft (92 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesRoad 9
CrossesAsh Slough
Location0.15 MI N of Ave 221/2
RouteCounty Highway 0
CountyMadera County
StateCalifornia
Coordinates37.07759, -120.38272
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.5 US tons
Inventory rating27.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadUnknown
Structure length302 ft (92 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic282 (2020)
Projected traffic657 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Road 9 over Ash Slough built?

It was built in 1967, making it 58 years old in 2025.

What condition is Road 9 over Ash Slough 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 January 2024.

How much traffic does Road 9 over Ash Slough carry?

About 282 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Road 9 over Ash Slough?

The structure is 302 ft (92 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns Road 9 over Ash Slough?

It is owned by the County Highway Agency.