US Bridges

Fern Mine Road over Archangel Creek

Fair

Matanuska-Susitna Borough, Alaska · Hatcher Pass Area · Structure no. 0915

Built
2015
10 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
70 ft
1 main span
Daily traffic
10
2018 count
Owner
State
State Highway Agency

About this bridge

Fern Mine Road over Archangel Creek is a steel truss - thru carrying Fern Mine Road over Archangel Creek in Matanuska-Susitna Borough, Alaska. It was built in 2015, so it is 10 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 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 10 vehicles a day, roughly 1% of them trucks, projected to reach 12 by 2035. The structure is 70 ft (21.3 m) long and 12 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesFern Mine Road
CrossesArchangel Creek
LocationHatcher Pass Area
RouteState Highway NSP00
CountyMatanuska-Susitna Borough
StateAlaska
Coordinates61.80232, -149.20259
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating51.8 US tons
Inventory rating41 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span70 ft (21.3 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2018)
Projected traffic12 by 2035
Trucks1%
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 Fern Mine Road over Archangel Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is Fern Mine Road over Archangel 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 June 2024.

How much traffic does Fern Mine Road over Archangel Creek carry?

About 10 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Fern Mine Road over Archangel Creek?

The structure is 70 ft (21.3 m) long with a longest span of 70 ft (21.3 m) and a deck 12 ft wide.

Who owns Fern Mine Road over Archangel Creek?

It is owned by the State Highway Agency.