US Bridges

Nautical Avenue over Salmon Creek Tributary

Poor

Kenai Peninsula Borough, Alaska · Mile Point 0.1 · Structure no. 2355

Built
1970
55 years old
Condition
Poor
inspected August 2023
Type
Other
Steel
Length
41 ft
1 main span
Daily traffic
100
2018 count
Owner
County
County Highway Agency

About this bridge

Nautical Avenue over Salmon Creek Tributary is a steel other carrying Nautical Avenue over Salmon Creek Tributary in Kenai Peninsula Borough, Alaska. It was built in 1970, so it is 55 years old, older than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 100 vehicles a day, roughly 1% of them trucks, projected to reach 110 by 2036. The structure is 41 ft (12.5 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNautical Avenue
CrossesSalmon Creek Tributary
LocationMile Point 0.1
RouteCounty Highway 0
StateAlaska
Coordinates60.16498, -149.40484
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.5 US tons
Inventory rating27.4 US tons

Structure

Structure typeOther
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span33 ft (10.1 m)
Deck width18 ft (5.6 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2018)
Projected traffic110 by 2036
Trucks1%
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

OwnerCounty Highway Agency
Maintained byCounty 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 Nautical Avenue over Salmon Creek Tributary built?

It was built in 1970, making it 55 years old in 2025.

What condition is Nautical Avenue over Salmon Creek Tributary in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does Nautical Avenue over Salmon Creek Tributary carry?

About 100 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Nautical Avenue over Salmon Creek Tributary?

The structure is 41 ft (12.5 m) long with a longest span of 33 ft (10.1 m) and a deck 18 ft wide.

Who owns Nautical Avenue over Salmon Creek Tributary?

It is owned by the County Highway Agency.