US Bridges

Mamalahoa over Kahalii Strm

FairPosted for load

Hawaii County, Hawaii · Tmk 2-7-10:14 · Structure no. 001270001100006

Built
1929
96 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
40 ft
1 main span
Daily traffic
500
1986 count
Owner
County
County Highway Agency

About this bridge

Mamalahoa over Kahalii Strm is a concrete stringer/multi-beam or girder carrying Mamalahoa over Kahalii Strm in Hawaii County, Hawaii. It was built in 1929, so it is 96 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 500 vehicles a day, projected to reach 625 by 2025. The structure is 40 ft (12.2 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesMamalahoa
CrossesKahalii Strm
LocationTmk 2-7-10:14
CountyHawaii County
StateHawaii
Coordinates19.81091, -155.0958
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating24.3 US tons
Inventory rating16.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span36 ft (11 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (1986)
Projected traffic625 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$204,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Mamalahoa over Kahalii Strm built?

It was built in 1929, making it 96 years old in 2025.

What condition is Mamalahoa over Kahalii Strm 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 March 2023.

How much traffic does Mamalahoa over Kahalii Strm carry?

About 500 vehicles per day (1986 count).

How long is Mamalahoa over Kahalii Strm?

The structure is 40 ft (12.2 m) long with a longest span of 36 ft (11 m) and a deck 20 ft wide.

Who owns Mamalahoa over Kahalii Strm?

It is owned by the County Highway Agency.