US Bridges

South Road over Waiakaloa Gulch

Good

Hawaii County, Hawaii · Tmk 9-6-08:2 · Structure no. 001960001100001

Built
1935
90 years old
Condition
Good
inspected February 2024
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
200
2008 count
Owner
County
County Highway Agency

About this bridge

South Road over Waiakaloa Gulch is a concrete slab carrying South Road over Waiakaloa Gulch in Hawaii County, Hawaii. It was built in 1935, so it is 90 years old, older 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 200 vehicles a day, projected to reach 244 by 2030. The structure is 22 ft (6.7 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSouth Road
CrossesWaiakaloa Gulch
LocationTmk 9-6-08:2
RouteCounty Highway 0
CountyHawaii County
StateHawaii
Coordinates19.26916, -155.47376
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2008)
Projected traffic244 by 2030
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesRelief for waterway
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$253,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was South Road over Waiakaloa Gulch built?

It was built in 1935, making it 90 years old in 2025.

What condition is South Road over Waiakaloa 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 February 2024.

How much traffic does South Road over Waiakaloa Gulch carry?

About 200 vehicles per day (2008 count).

How long is South Road over Waiakaloa Gulch?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 16 ft wide.

Who owns South Road over Waiakaloa Gulch?

It is owned by the County Highway Agency.