US Bridges

Piilani HWY over Manawainui Strm

Fair

Maui County, Hawaii · SR31 at Manawainui Strm · Structure no. 009000310902758

Built
1993
32 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
66 ft
1 main span
Daily traffic
245
1996 count
Owner
County
County Highway Agency

About this bridge

Piilani HWY over Manawainui Strm is a concrete stringer/multi-beam or girder carrying Piilani HWY over Manawainui Strm in Maui County, Hawaii. It was built in 1993, so it is 32 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 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 245 vehicles a day, projected to reach 306 by 2025. The structure is 66 ft (20 m) long and 27 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesPiilani HWY
CrossesManawainui Strm
LocationSR31 at Manawainui Strm
RouteCounty Highway 31
CountyMaui County
StateHawaii
Coordinates20.62244, -156.22218
Functional classRural Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length66 ft (20 m)
Longest span63 ft (19.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic245 (1996)
Projected traffic306 by 2025
Trucks0%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$329,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Piilani HWY over Manawainui Strm built?

It was built in 1993, making it 32 years old in 2025.

What condition is Piilani HWY over Manawainui Strm 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 2024.

How much traffic does Piilani HWY over Manawainui Strm carry?

About 245 vehicles per day (1996 count).

How long is Piilani HWY over Manawainui Strm?

The structure is 66 ft (20 m) long with a longest span of 63 ft (19.2 m) and a deck 27 ft wide.

Who owns Piilani HWY over Manawainui Strm?

It is owned by the County Highway Agency.