US Bridges

Route 311 over Kolaloa Gulch

Fair

Maui County, Hawaii · 5.16 MI S Mokulele HWY · Structure no. 009003110300516

Built
2005
20 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
106 ft
8 main spans
Daily traffic
34,300
2017 count
Owner
State
State Highway Agency

About this bridge

Route 311 over Kolaloa Gulch is a concrete culvert carrying Route 311 over Kolaloa Gulch in Maui County, Hawaii. It was built in 2005, so it is 20 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 34,300 vehicles a day, projected to reach 40,200 by 2027. The structure is 106 ft (32.4 m) long and 107 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesRoute 311
CrossesKolaloa Gulch
Location5.16 MI S Mokulele HWY
RouteU.S. Route 311
CountyMaui County
StateHawaii
Coordinates20.80329, -156.46695
Functional classRural Principal Arterial - Other

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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating46.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans8
Design loadHL 93
Structure length106 ft (32.4 m)
Longest span12 ft (3.7 m)
Deck width107 ft (32.6 m)
Roadway width105 ft (31.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,300 (2017)
Projected traffic40,200 by 2027
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Route 311 over Kolaloa Gulch built?

It was built in 2005, making it 20 years old in 2025.

What condition is Route 311 over Kolaloa Gulch 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 February 2025.

How much traffic does Route 311 over Kolaloa Gulch carry?

About 34,300 vehicles per day (2017 count).

How long is Route 311 over Kolaloa Gulch?

The structure is 106 ft (32.4 m) long with a longest span of 12 ft (3.7 m) and a deck 107 ft wide.

Who owns Route 311 over Kolaloa Gulch?

It is owned by the State Highway Agency.