US Bridges

Edgerton/Mccarthy over Kuskulana River

Fair

County 066, Alaska · Mile Point 50.6 · Structure no. 0397

Built
1910
115 years old, rebuilt 1988
Condition
Fair
inspected August 2023
Type
Truss - Deck
Steel
Length
775 ft
3 main spans
Daily traffic
70
2020 count
Owner
State
State Highway Agency

About this bridge

Edgerton/Mccarthy over Kuskulana River is a steel truss - deck carrying Edgerton/Mccarthy over Kuskulana River in County 066, Alaska. It was built in 1910 and reconstructed in 1988, so it is 115 years old, older than the Alaska average of 35.9 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 70 vehicles a day, roughly 11% of them trucks, projected to reach 90 by 2039. The structure is 775 ft (236.1 m) long and 15 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesEdgerton/Mccarthy
CrossesKuskulana River
LocationMile Point 50.6
RouteState Highway 850
CountyCounty 066
StateAlaska
Coordinates61.48889, -144.01556
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating80.1 US tons
Inventory rating61.6 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckWood or timber
Main spans3 (+8 approach)
Design loadHS 20 + Mod
Structure length775 ft (236.1 m)
Longest span230 ft (70.1 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2020)
Projected traffic90 by 2039
Trucks11%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Edgerton/Mccarthy over Kuskulana River built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1988.

What condition is Edgerton/Mccarthy over Kuskulana River 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 August 2023.

How much traffic does Edgerton/Mccarthy over Kuskulana River carry?

About 70 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is Edgerton/Mccarthy over Kuskulana River?

The structure is 775 ft (236.1 m) long with a longest span of 230 ft (70.1 m) and a deck 15 ft wide.

Who owns Edgerton/Mccarthy over Kuskulana River?

It is owned by the State Highway Agency.