US Bridges

Eight Mile Road over White Slough (honker Cut

Fair

San Joaquin County, California · 5 MI West of I-5 · Structure no. 29C0219

Built
1936
89 years old, rebuilt 1975
Condition
Fair
inspected January 2024
Type
Movable - Swing
Steel
Length
480 ft
1 main span
Daily traffic
958
2013 count
Owner
County
County Highway Agency

About this bridge

Eight Mile Road over White Slough (honker Cut is a steel movable - swing carrying Eight Mile Road over White Slough (honker Cut in San Joaquin County, California. It was built in 1936 and reconstructed in 1975, so it is 89 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 958 vehicles a day, roughly 15% of them trucks, projected to reach 1,095 by 2042. The structure is 480 ft (146.3 m) long and 21 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesEight Mile Road
CrossesWhite Slough (honker Cut
Location5 MI West of I-5
RouteCounty Highway 0
CountySan Joaquin County
StateCalifornia
Coordinates38.05934, -121.46001
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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.4 US tons
Inventory rating19 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckClosed grating
Main spans1 (+16 approach)
Design loadUnknown
Structure length480 ft (146.3 m)
Longest span204 ft (62.2 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic958 (2013)
Projected traffic1,095 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Eight Mile Road over White Slough (honker Cut built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1975.

What condition is Eight Mile Road over White Slough (honker Cut 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 Eight Mile Road over White Slough (honker Cut carry?

About 958 vehicles per day (2013 count), of which roughly 15% are trucks.

How long is Eight Mile Road over White Slough (honker Cut?

The structure is 480 ft (146.3 m) long with a longest span of 204 ft (62.2 m) and a deck 21 ft wide.

Who owns Eight Mile Road over White Slough (honker Cut?

It is owned by the County Highway Agency.