US Bridges

Mamalahoa over Waikaumalo Str

FairPosted for load

Hawaii County, Hawaii · Tmk 3-2-02:62 · Structure no. 001320001100002

Built
1920
105 years old
Condition
Fair
inspected March 2023
Type
Girder and Floorbeam System
Wood or Timber
Length
107 ft
5 main spans
Daily traffic
200
2008 count
Owner
County
County Highway Agency

About this bridge

Mamalahoa over Waikaumalo Str is a wood or timber girder and floorbeam system carrying Mamalahoa over Waikaumalo Str in Hawaii County, Hawaii. It was built in 1920, so it is 105 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. Its operating status is: posted for load restriction.

It carries about 200 vehicles a day, projected to reach 244 by 2030. The structure is 107 ft (32.6 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMamalahoa
CrossesWaikaumalo Str
LocationTmk 3-2-02:62
RouteCounty Highway 0
CountyHawaii County
StateHawaii
Coordinates19.93278, -155.16257
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 23 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating20 US tons
Inventory rating9.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadUnknown
Structure length107 ft (32.6 m)
Longest span30 ft (9.1 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 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
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$540,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Mamalahoa over Waikaumalo Str built?

It was built in 1920, making it 105 years old in 2025.

What condition is Mamalahoa over Waikaumalo Str 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 Waikaumalo Str carry?

About 200 vehicles per day (2008 count).

How long is Mamalahoa over Waikaumalo Str?

The structure is 107 ft (32.6 m) long with a longest span of 30 ft (9.1 m) and a deck 20 ft wide.

Who owns Mamalahoa over Waikaumalo Str?

It is owned by the County Highway Agency.