US Bridges

Kal HWY Waimanalo over 30X10 Rcb Culvt

Fair

Honolulu County, Hawaii · Waimanalo Drainage Ditch · Structure no. 003000720300574

Built
1978
47 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete
Length
30 ft
1 main span
Daily traffic
10,600
2020 count
Owner
State
State Highway Agency

About this bridge

Kal HWY Waimanalo over 30X10 Rcb Culvt is a concrete culvert carrying Kal HWY Waimanalo over 30X10 Rcb Culvt in Honolulu County, Hawaii. It was built in 1978, so it is 47 years old, younger than the Hawaii average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 10,600 vehicles a day, roughly 21% of them trucks, projected to reach 26,340 by 2025. The structure is 30 ft (9.1 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKal HWY Waimanalo
Crosses30X10 Rcb Culvt
LocationWaimanalo Drainage Ditch
RouteU.S. Route 72
CountyHonolulu County
StateHawaii
Coordinates21.32954, -157.6915
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width73 ft (22.1 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,600 (2020)
Projected traffic26,340 by 2025
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Kal HWY Waimanalo over 30X10 Rcb Culvt built?

It was built in 1978, making it 47 years old in 2025.

What condition is Kal HWY Waimanalo over 30X10 Rcb Culvt 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 August 2024.

How much traffic does Kal HWY Waimanalo over 30X10 Rcb Culvt carry?

About 10,600 vehicles per day (2020 count), of which roughly 21% are trucks.

How long is Kal HWY Waimanalo over 30X10 Rcb Culvt?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 73 ft wide.

Who owns Kal HWY Waimanalo over 30X10 Rcb Culvt?

It is owned by the State Highway Agency.