US Bridges

Copper River HWY over East Fork 18 Mile Creek

Good

County 063, Alaska · Mile Point 18.7 · Structure no. 4129

Built
2021
4 years old
Condition
Good
inspected September 2024
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
29 ft
1 main span
Daily traffic
170
2020 count
Owner
State
State Highway Agency

About this bridge

Copper River HWY over East Fork 18 Mile Creek is a aluminum, wrought iron, or cast iron culvert carrying Copper River HWY over East Fork 18 Mile Creek in County 063, Alaska. It was built in 2021, so it is 4 years old, younger than the Alaska average of 35.9 years.

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

It carries about 170 vehicles a day, roughly 8% of them trucks, projected to reach 270 by 2039. The structure is 29 ft (8.9 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesCopper River HWY
CrossesEast Fork 18 Mile Creek
LocationMile Point 18.7
RouteState Highway 851
StateAlaska
Coordinates60.46061, -145.29289
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating89.3 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans1
Design loadHL 93
Structure length29 ft (8.9 m)
Longest span29 ft (8.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2020)
Projected traffic270 by 2039
Trucks8%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Copper River HWY over East Fork 18 Mile Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is Copper River HWY over East Fork 18 Mile Creek 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 September 2024.

How much traffic does Copper River HWY over East Fork 18 Mile Creek carry?

About 170 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Copper River HWY over East Fork 18 Mile Creek?

The structure is 29 ft (8.9 m) long with a longest span of 29 ft (8.8 m).

Who owns Copper River HWY over East Fork 18 Mile Creek?

It is owned by the State Highway Agency.