US Bridges

State Route 88 over Caples Lake Spillway

Fair

Alpine County, California · 10-ALP-088-0.46 · Structure no. 31 0015

Built
1987
38 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
115 ft
1 main span
Daily traffic
2,800
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 88 over Caples Lake Spillway is a prestressed concrete box beam or girders - multiple carrying State Route 88 over Caples Lake Spillway in Alpine County, California. It was built in 1987, so it is 38 years old, younger 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 2,800 vehicles a day, projected to reach 11,254 by 2045. The structure is 115 ft (35.1 m) long and 44 ft wide. If it were closed, the detour would be 46.6 mi (75 km).

Location

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CarriesState Route 88
CrossesCaples Lake Spillway
Location10-ALP-088-0.46
RouteState Highway 88
CountyAlpine County
StateCalifornia
Coordinates38.70347, -120.06508
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionOctober 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating39.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length115 ft (35.1 m)
Longest span113 ft (34.4 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2009)
Projected traffic11,254 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed46.6 mi (75 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 88 over Caples Lake Spillway built?

It was built in 1987, making it 38 years old in 2025.

What condition is State Route 88 over Caples Lake Spillway 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 October 2023.

How much traffic does State Route 88 over Caples Lake Spillway carry?

About 2,800 vehicles per day (2009 count).

How long is State Route 88 over Caples Lake Spillway?

The structure is 115 ft (35.1 m) long with a longest span of 113 ft (34.4 m) and a deck 44 ft wide.

Who owns State Route 88 over Caples Lake Spillway?

It is owned by the State Highway Agency.