US Bridges

Old Mamalahoa HWY over Kalaoa Strm

FairPosted for load

Hawaii County, Hawaii · 2-7-008:013 · Structure no. 001270001100004

Built
1929
96 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
40 ft
1 main span
Daily traffic
1,000
1986 count
Owner
County
County Highway Agency

About this bridge

Old Mamalahoa HWY over Kalaoa Strm is a concrete stringer/multi-beam or girder carrying Old Mamalahoa HWY over Kalaoa 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 1,000 vehicles a day, projected to reach 1,250 by 2025. The structure is 40 ft (12.2 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesOld Mamalahoa HWY
CrossesKalaoa Strm
Location2-7-008:013
RouteCounty Highway 27000
CountyHawaii County
StateHawaii
Coordinates19.80165, -155.09316
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 loadUnknown
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (1986)
Projected traffic1,250 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$252,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Mamalahoa HWY over Kalaoa Strm built?

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

What condition is Old Mamalahoa HWY over Kalaoa 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 July 2024.

How much traffic does Old Mamalahoa HWY over Kalaoa Strm carry?

About 1,000 vehicles per day (1986 count).

How long is Old Mamalahoa HWY over Kalaoa Strm?

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

Who owns Old Mamalahoa HWY over Kalaoa Strm?

It is owned by the County Highway Agency.