US Bridges

Mano Ave. over Nanakuli Drainage Chnl

Fair

Honolulu County, Hawaii · Waianae Tmk 8-9-02:1 · Structure no. 003850001100001

Built
1979
46 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
43 ft
1 main span
Daily traffic
1,148
1990 count
Owner
County
County Highway Agency

About this bridge

Mano Ave. over Nanakuli Drainage Chnl is a prestressed concrete continuous stringer/multi-beam or girder carrying Mano Ave. over Nanakuli Drainage Chnl in Honolulu County, Hawaii. It was built in 1979, so it is 46 years old, younger 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 1,148 vehicles a day, projected to reach 1,435 by 2025. The structure is 43 ft (13.1 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMano Ave.
CrossesNanakuli Drainage Chnl
LocationWaianae Tmk 8-9-02:1
RouteCity Street 0
CountyHonolulu County
StateHawaii
Coordinates21.38346, -158.14157
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span35 ft (10.7 m)
Deck width40 ft (12.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,148 (1990)
Projected traffic1,435 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mano Ave. over Nanakuli Drainage Chnl built?

It was built in 1979, making it 46 years old in 2025.

What condition is Mano Ave. over Nanakuli Drainage Chnl 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 2023.

How much traffic does Mano Ave. over Nanakuli Drainage Chnl carry?

About 1,148 vehicles per day (1990 count).

How long is Mano Ave. over Nanakuli Drainage Chnl?

The structure is 43 ft (13.1 m) long with a longest span of 35 ft (10.7 m) and a deck 40 ft wide.

Who owns Mano Ave. over Nanakuli Drainage Chnl?

It is owned by the County Highway Agency.