US Bridges

Mokapu Road over Canal

Fair

Honolulu County, Hawaii · 0.2 KM East of G Street · Structure no. 2HI1541

Built
1953
72 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
4,000
2015 count
Owner
Federal
Navy / Marines

About this bridge

Mokapu Road over Canal is a concrete culvert carrying Mokapu Road over Canal in Honolulu County, Hawaii. It was built in 1953, so it is 72 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 4,000 vehicles a day, roughly 5% of them trucks, projected to reach 5,000 by 2043. The structure is 21 ft (6.3 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMokapu Road
CrossesCanal
Location0.2 KM East of G Street
RouteFederal Lands Road 0
CountyHonolulu County
StateHawaii
Coordinates21.44382, -157.75072
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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating25.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length21 ft (6.3 m)
Longest span10 ft (3.2 m)
Deck width65 ft (19.9 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2015)
Projected traffic5,000 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNavy / Marines
Maintained byNavy / Marines
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$54,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mokapu Road over Canal built?

It was built in 1953, making it 72 years old in 2025.

What condition is Mokapu Road over 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 September 2024.

How much traffic does Mokapu Road over Canal carry?

About 4,000 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Mokapu Road over Canal?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3.2 m) and a deck 65 ft wide.

Who owns Mokapu Road over Canal?

It is owned by the Navy / Marines.