US Bridges

Old Mamalahoa HWY over Opea Stream

PoorPosted for load

Hawaii County, Hawaii · Tmk: 3-2-001:018 · Structure no. 001310001100002

Built
1912
113 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
42 ft
1 main span
Daily traffic
20
1986 count
Owner
County
County Highway Agency

About this bridge

Old Mamalahoa HWY over Opea Stream is a concrete stringer/multi-beam or girder carrying Old Mamalahoa HWY over Opea Stream in Hawaii County, Hawaii. It was built in 1912, so it is 113 years old, older than the Hawaii average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, projected to reach 25 by 2025. The structure is 42 ft (12.8 m) long and 19 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesOld Mamalahoa HWY
CrossesOpea Stream
LocationTmk: 3-2-001:018
CountyHawaii County
StateHawaii
Coordinates19.92133, -155.15484
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating18.2 US tons
Inventory rating11.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span42 ft (12.8 m)
Deck width19 ft (5.7 m)
Roadway width17 ft (5.2 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
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$250,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Mamalahoa HWY over Opea Stream built?

It was built in 1912, making it 113 years old in 2025.

What condition is Old Mamalahoa HWY over Opea Stream in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does Old Mamalahoa HWY over Opea Stream carry?

About 20 vehicles per day (1986 count).

How long is Old Mamalahoa HWY over Opea Stream?

The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 19 ft wide.

Who owns Old Mamalahoa HWY over Opea Stream?

It is owned by the County Highway Agency.