US Bridges

Piilani HWY over Manawainui Strm

FairPosted for load

Maui County, Hawaii · 13.79MI W/Rd to Hamoa · Structure no. 009000310903514

Built
1947
78 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
101 ft
3 main spans
Daily traffic
245
1998 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 1947, so it is 78 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. Its operating status is: posted for load restriction.

It carries about 245 vehicles a day, projected to reach 306 by 2025. The structure is 101 ft (30.9 m) long and 19 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesPiilani HWY
CrossesManawainui Strm
Location13.79MI W/Rd to Hamoa
RouteCounty Highway 360
CountyMaui County
StateHawaii
Coordinates20.6391, -156.11747
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating5.7 US tons
Inventory rating4.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length101 ft (30.9 m)
Longest span38 ft (11.7 m)
Deck width19 ft (5.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic245 (1998)
Projected traffic306 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesRelief for waterway
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$975,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Piilani HWY over Manawainui Strm built?

It was built in 1947, making it 78 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 (1998 count).

How long is Piilani HWY over Manawainui Strm?

The structure is 101 ft (30.9 m) long with a longest span of 38 ft (11.7 m) and a deck 19 ft wide.

Who owns Piilani HWY over Manawainui Strm?

It is owned by the County Highway Agency.