US Bridges

Mamala Bay Drive over Kumumauu Canal

Fair

Honolulu County, Hawaii · 0.9 KM E of Seaman Ave · Structure no. 1HI85100

Built
1943
82 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
59 ft
9 main spans
Daily traffic
500
2017 count
Owner
Federal
Navy / Marines

About this bridge

Mamala Bay Drive over Kumumauu Canal is a concrete culvert carrying Mamala Bay Drive over Kumumauu Canal in Honolulu County, Hawaii. It was built in 1943, so it is 82 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.

It carries about 500 vehicles a day, roughly 10% of them trucks, projected to reach 750 by 2043. The structure is 59 ft (17.9 m) long and 35 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMamala Bay Drive
CrossesKumumauu Canal
Location0.9 KM E of Seaman Ave
CountyHonolulu County
StateHawaii
Coordinates21.31969, -157.94971
Functional classUrban 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.8 US tons
Inventory rating37.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans9
Design loadUnknown
Structure length59 ft (17.9 m)
Longest span6 ft (1.7 m)
Deck width35 ft (10.8 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2017)
Projected traffic750 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNavy / Marines
Maintained byNavy / Marines
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$95,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mamala Bay Drive over Kumumauu Canal built?

It was built in 1943, making it 82 years old in 2025.

What condition is Mamala Bay Drive over Kumumauu Canal 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 June 2024.

How much traffic does Mamala Bay Drive over Kumumauu Canal carry?

About 500 vehicles per day (2017 count), of which roughly 10% are trucks.

How long is Mamala Bay Drive over Kumumauu Canal?

The structure is 59 ft (17.9 m) long with a longest span of 6 ft (1.7 m) and a deck 35 ft wide.

Who owns Mamala Bay Drive over Kumumauu Canal?

It is owned by the Navy / Marines.