US Bridges

Mamalahoa over Mamalahoa/Old RR Xing

GoodPosted for load

Hawaii County, Hawaii · Tmk 2-9-02:24 · Structure no. 001290001100002

Built
1930
95 years old
Condition
Good
inspected March 2023
Type
Arch - Deck
Concrete
Length
58 ft
1 main span
Daily traffic
20
1986 count
Owner
County
County Highway Agency

About this bridge

Mamalahoa over Mamalahoa/Old RR Xing is a concrete arch - deck carrying Mamalahoa over Mamalahoa/Old RR Xing in Hawaii County, Hawaii. It was built in 1930, so it is 95 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. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, projected to reach 25 by 2025. The structure is 58 ft (17.7 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMamalahoa
CrossesMamalahoa/Old RR Xing
LocationTmk 2-9-02:24
CountyHawaii County
StateHawaii
Coordinates19.89528, -155.12615
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 protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 23 months
Operating statusPosted for load restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length58 ft (17.7 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6.1 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (1986)
Projected traffic25 by 2025
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$298,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mamalahoa over Mamalahoa/Old RR Xing built?

It was built in 1930, making it 95 years old in 2025.

What condition is Mamalahoa over Mamalahoa/Old RR Xing 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 March 2023.

How much traffic does Mamalahoa over Mamalahoa/Old RR Xing carry?

About 20 vehicles per day (1986 count).

How long is Mamalahoa over Mamalahoa/Old RR Xing?

The structure is 58 ft (17.7 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns Mamalahoa over Mamalahoa/Old RR Xing?

It is owned by the County Highway Agency.