US Bridges

Springville Ave over Porter Slough

Fair

Tulare County, California · At Success RD · Structure no. 46C0056

Built
1937
88 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
100 ft
5 main spans
Daily traffic
3,650
2013 count
Owner
County
County Highway Agency

About this bridge

Springville Ave over Porter Slough is a wood or timber stringer/multi-beam or girder carrying Springville Ave over Porter Slough in Tulare County, California. It was built in 1937, so it is 88 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 3,650 vehicles a day, roughly 2% of them trucks, projected to reach 4,826 by 2043. The structure is 100 ft (30.5 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSpringville Ave
CrossesPorter Slough
LocationAt Success RD
RouteCounty Highway 0
CountyTulare County
StateCalifornia
Coordinates36.05504, -118.97344
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length100 ft (30.5 m)
Longest span19 ft (5.8 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,650 (2013)
Projected traffic4,826 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Springville Ave over Porter Slough built?

It was built in 1937, making it 88 years old in 2025.

What condition is Springville Ave 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 Springville Ave over Porter Slough carry?

About 3,650 vehicles per day (2013 count), of which roughly 2% are trucks.

How long is Springville Ave over Porter Slough?

The structure is 100 ft (30.5 m) long with a longest span of 19 ft (5.8 m) and a deck 32 ft wide.

Who owns Springville Ave over Porter Slough?

It is owned by the County Highway Agency.