US Bridges

CR 168 over Porter Slough

Good

Tulare County, California · 0.1 MI S of Ave 188 · Structure no. 46C0289

Built
1951
74 years old
Condition
Good
inspected February 2023
Type
Slab
Concrete Continuous
Length
46 ft
3 main spans
Daily traffic
375
1978 count
Owner
County
County Highway Agency

About this bridge

CR 168 over Porter Slough is a concrete continuous slab carrying CR 168 over Porter Slough in Tulare County, California. It was built in 1951, so it is 74 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 375 vehicles a day, roughly 10% of them trucks, projected to reach 655 by 2041. The structure is 46 ft (14 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesCR 168
CrossesPorter Slough
Location0.1 MI S of Ave 188
RouteCounty Highway 0
Coordinates36.13058, -119.19659
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating24.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length46 ft (14 m)
Longest span32 ft (9.8 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic375 (1978)
Projected traffic655 by 2041
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 CR 168 over Porter Slough built?

It was built in 1951, making it 74 years old in 2025.

What condition is CR 168 over Porter Slough in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2023.

How much traffic does CR 168 over Porter Slough carry?

About 375 vehicles per day (1978 count), of which roughly 10% are trucks.

How long is CR 168 over Porter Slough?

The structure is 46 ft (14 m) long with a longest span of 32 ft (9.8 m) and a deck 28 ft wide.

Who owns CR 168 over Porter Slough?

It is owned by the County Highway Agency.