US Bridges

Kapuna Road over Ahualoa Gulch

Good

Hawaii County, Hawaii · Tmk: 4-6-008:001 · Structure no. 001460001100006

Built
1984
41 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
700
1985 count
Owner
County
County Highway Agency

About this bridge

Kapuna Road over Ahualoa Gulch is a concrete culvert carrying Kapuna Road over Ahualoa Gulch in Hawaii County, Hawaii. It was built in 1984, so it is 41 years old, younger than the Hawaii average of 63.8 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 700 vehicles a day, projected to reach 875 by 2025. The structure is 32 ft (9.7 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesKapuna Road
CrossesAhualoa Gulch
LocationTmk: 4-6-008:001
RouteCounty Highway 0
CountyHawaii County
StateHawaii
Coordinates20.06635, -155.49399
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.8 US tons
Inventory rating63.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length32 ft (9.7 m)
Longest span10 ft (3.1 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (1985)
Projected traffic875 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$8,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Kapuna Road over Ahualoa Gulch built?

It was built in 1984, making it 41 years old in 2025.

What condition is Kapuna Road over Ahualoa Gulch 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 October 2024.

How much traffic does Kapuna Road over Ahualoa Gulch carry?

About 700 vehicles per day (1985 count).

How long is Kapuna Road over Ahualoa Gulch?

The structure is 32 ft (9.7 m) long with a longest span of 10 ft (3.1 m) and a deck 29 ft wide.

Who owns Kapuna Road over Ahualoa Gulch?

It is owned by the County Highway Agency.