US Bridges

Old Mamalahoa HWY over Umauma Stream

Fair

Hawaii County, Hawaii · Tmk 3-1-01:27 · Structure no. 001310001100001

Built
1920
105 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
110 ft
3 main spans
Daily traffic
980
1986 count
Owner
County
County Highway Agency

About this bridge

Old Mamalahoa HWY over Umauma Stream is a concrete continuous stringer/multi-beam or girder carrying Old Mamalahoa HWY over Umauma Stream 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.

It carries about 980 vehicles a day, projected to reach 1,410 by 2030. The structure is 110 ft (33.5 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesOld Mamalahoa HWY
CrossesUmauma Stream
LocationTmk 3-1-01:27
CountyHawaii County
StateHawaii
Coordinates19.90613, -155.14111
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.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length110 ft (33.5 m)
Longest span37 ft (11.3 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic980 (1986)
Projected traffic1,410 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$510,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Mamalahoa HWY over Umauma Stream built?

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

What condition is Old Mamalahoa HWY over Umauma Stream 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 May 2023.

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

About 980 vehicles per day (1986 count).

How long is Old Mamalahoa HWY over Umauma Stream?

The structure is 110 ft (33.5 m) long with a longest span of 37 ft (11.3 m) and a deck 20 ft wide.

Who owns Old Mamalahoa HWY over Umauma Stream?

It is owned by the County Highway Agency.