US Bridges

Mamalahoa over Mamalahoa/Nienie Gulch

Fair

Hawaii County, Hawaii · Tmk: 4-6-007:049 · Structure no. 001460001100001

Built
1923
102 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
50 ft
2 main spans
Daily traffic
800
1981 count
Owner
County
County Highway Agency

About this bridge

Mamalahoa over Mamalahoa/Nienie Gulch is a concrete continuous stringer/multi-beam or girder carrying Mamalahoa over Mamalahoa/Nienie Gulch in Hawaii County, Hawaii. It was built in 1923, so it is 102 years old, older 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 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 800 vehicles a day, projected to reach 1,000 by 2025. The structure is 50 ft (15.2 m) long and 20 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMamalahoa
CrossesMamalahoa/Nienie Gulch
LocationTmk: 4-6-007:049
RouteCounty Highway 0
CountyHawaii County
StateHawaii
Coordinates20.06508, -155.48102
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length50 ft (15.2 m)
Longest span25 ft (7.6 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (1981)
Projected traffic1,000 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed5 mi (8 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$325,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Mamalahoa over Mamalahoa/Nienie Gulch built?

It was built in 1923, making it 102 years old in 2025.

What condition is Mamalahoa over Mamalahoa/Nienie Gulch 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 September 2024.

How much traffic does Mamalahoa over Mamalahoa/Nienie Gulch carry?

About 800 vehicles per day (1981 count).

How long is Mamalahoa over Mamalahoa/Nienie Gulch?

The structure is 50 ft (15.2 m) long with a longest span of 25 ft (7.6 m) and a deck 20 ft wide.

Who owns Mamalahoa over Mamalahoa/Nienie Gulch?

It is owned by the County Highway Agency.