US Bridges

Waipahu ST over Drainage Canal #1

Good

Honolulu County, Hawaii · 250W/HIANAKIU ST · Structure no. 003083661400001

Built
1971
54 years old
Condition
Good
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
7,950
1980 count
Owner
County
County Highway Agency

About this bridge

Waipahu ST over Drainage Canal #1 is a prestressed concrete tee beam carrying Waipahu ST over Drainage Canal #1 in Honolulu County, Hawaii. It was built in 1971, so it is 54 years old, younger than the Hawaii average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,950 vehicles a day, projected to reach 9,938 by 2025. The structure is 67 ft (20.4 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesWaipahu ST
CrossesDrainage Canal #1
Location250W/HIANAKIU ST
RouteCity Street 7142
CountyHonolulu County
StateHawaii
Coordinates21.39407, -157.99871
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating39.7 US tons
Inventory rating23.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span62 ft (18.9 m)
Deck width60 ft (18.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,950 (1980)
Projected traffic9,938 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Waipahu ST over Drainage Canal #1 built?

It was built in 1971, making it 54 years old in 2025.

What condition is Waipahu ST over Drainage Canal #1 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Waipahu ST over Drainage Canal #1 carry?

About 7,950 vehicles per day (1980 count).

How long is Waipahu ST over Drainage Canal #1?

The structure is 67 ft (20.4 m) long with a longest span of 62 ft (18.9 m) and a deck 60 ft wide.

Who owns Waipahu ST over Drainage Canal #1?

It is owned by the County Highway Agency.