US Bridges

Ave 188 over Porter Slough

Fair

Tulare County, California · 0.25 MI W of RD 168 · Structure no. 46C0305

Built
1959
66 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete
Length
35 ft
1 main span
Daily traffic
75
1978 count
Owner
County
County Highway Agency

About this bridge

Ave 188 over Porter Slough is a concrete slab carrying Ave 188 over Porter Slough in Tulare County, California. It was built in 1959, so it is 66 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 75 vehicles a day, roughly 10% of them trucks, projected to reach 163 by 2043. The structure is 35 ft (10.7 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesAve 188
CrossesPorter Slough
Location0.25 MI W of RD 168
RouteCounty Highway 0
CountyTulare County
StateCalifornia
Coordinates36.13083, -119.20032
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.
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 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating29.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length35 ft (10.7 m)
Longest span32 ft (9.8 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (1978)
Projected traffic163 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Ave 188 over Porter Slough built?

It was built in 1959, making it 66 years old in 2025.

What condition is Ave 188 over Porter 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 February 2023.

How much traffic does Ave 188 over Porter Slough carry?

About 75 vehicles per day (1978 count), of which roughly 10% are trucks.

How long is Ave 188 over Porter Slough?

The structure is 35 ft (10.7 m) long with a longest span of 32 ft (9.8 m) and a deck 28 ft wide.

Who owns Ave 188 over Porter Slough?

It is owned by the County Highway Agency.