US Bridges

Edgerton/Mccarthy over Gilahina River

FairPosted for load

County 066, Alaska · Mile Point 62.4 · Structure no. 1194

Built
1991
34 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
70
2020 count
Owner
State
State Highway Agency

About this bridge

Edgerton/Mccarthy over Gilahina River is a steel stringer/multi-beam or girder carrying Edgerton/Mccarthy over Gilahina River in County 066, Alaska. It was built in 1991, so it is 34 years old, younger 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 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 70 vehicles a day, roughly 11% of them trucks, projected to reach 90 by 2039. The structure is 41 ft (12.5 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesEdgerton/Mccarthy
CrossesGilahina River
LocationMile Point 62.4
RouteState Highway 850
CountyCounty 066
StateAlaska
Coordinates61.43806, -143.71861
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating42.1 US tons
Inventory rating25.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span39 ft (12 m)
Deck width14 ft (4.4 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 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 Edgerton/Mccarthy over Gilahina River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Edgerton/Mccarthy over Gilahina 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 Gilahina River carry?

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

How long is Edgerton/Mccarthy over Gilahina River?

The structure is 41 ft (12.5 m) long with a longest span of 39 ft (12 m) and a deck 14 ft wide.

Who owns Edgerton/Mccarthy over Gilahina River?

It is owned by the State Highway Agency.