US Bridges

Ainalako RD over 4 Mile Creek

Fair

Hawaii County, Hawaii · Tmk 2-4-005:056 · Structure no. 001240001100005

Built
1972
53 years old
Condition
Fair
inspected November 2023
Type
Culvert
Steel
Length
30 ft
4 main spans
Daily traffic
4,120
1987 count
Owner
County
County Highway Agency

About this bridge

Ainalako RD over 4 Mile Creek is a steel culvert carrying Ainalako RD over 4 Mile Creek in Hawaii County, Hawaii. It was built in 1972, so it is 53 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 4,120 vehicles a day, projected to reach 5,150 by 2025. The structure is 30 ft (9.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesAinalako RD
Crosses4 Mile Creek
LocationTmk 2-4-005:056
CountyHawaii County
StateHawaii
Coordinates19.66018, -155.09141
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
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length30 ft (9.2 m)
Longest span6 ft (1.7 m)
Deck width40 ft (12.3 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,120 (1987)
Projected traffic5,150 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRelief for waterway
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$120,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Ainalako RD over 4 Mile Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Ainalako RD over 4 Mile Creek 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 November 2023.

How much traffic does Ainalako RD over 4 Mile Creek carry?

About 4,120 vehicles per day (1987 count).

How long is Ainalako RD over 4 Mile Creek?

The structure is 30 ft (9.2 m) long with a longest span of 6 ft (1.7 m) and a deck 40 ft wide.

Who owns Ainalako RD over 4 Mile Creek?

It is owned by the County Highway Agency.