US Bridges

Porter RD over Porter Slough

Fair

Tulare County, California · 0.1 MI S of Morton Ave · Structure no. 46C0111

Built
1955
70 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete Continuous
Length
69 ft
3 main spans
Daily traffic
7,500
1982 count
Owner
City
City or Municipal Highway Agency

About this bridge

Porter RD over Porter Slough is a concrete continuous slab carrying Porter RD over Porter Slough in Tulare County, California. It was built in 1955, so it is 70 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 7,500 vehicles a day, roughly 2% of them trucks, projected to reach 8,869 by 2043. The structure is 69 ft (21 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPorter RD
CrossesPorter Slough
Location0.1 MI S of Morton Ave
RouteCity Street 0
CountyTulare County
StateCalifornia
Coordinates36.07119, -119.03907
Functional classUrban 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 inspectionFebruary 2025
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 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 rating74 US tons
Inventory rating44.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length69 ft (21 m)
Longest span26 ft (7.9 m)
Deck width44 ft (13.3 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,500 (1982)
Projected traffic8,869 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Porter RD over Porter Slough built?

It was built in 1955, making it 70 years old in 2025.

What condition is Porter RD 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 2025.

How much traffic does Porter RD over Porter Slough carry?

About 7,500 vehicles per day (1982 count), of which roughly 2% are trucks.

How long is Porter RD over Porter Slough?

The structure is 69 ft (21 m) long with a longest span of 26 ft (7.9 m) and a deck 44 ft wide.

Who owns Porter RD over Porter Slough?

It is owned by the City or Municipal Highway Agency.