US Bridges

Trail River Cg RD over Trail River

Fair

Kenai Peninsula Borough, Alaska · 24 Mi. N. of Seward · Structure no. 100430000003420

Built
1965
60 years old
Condition
Fair
inspected September 2022
Type
Box Beam or Girders - Multiple
Wood or Timber
Length
142 ft
2 main spans
Daily traffic
10
Owner
Federal
U.S. Forest Service

About this bridge

Trail River Cg RD over Trail River is a wood or timber box beam or girders - multiple carrying Trail River Cg RD over Trail River in Kenai Peninsula Borough, Alaska. It was built in 1965, so it is 60 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 10 vehicles a day, projected to reach 15 by 2045. The structure is 142 ft (43.3 m) long and 25 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

CarriesTrail River Cg RD
CrossesTrail River
Location24 Mi. N. of Seward
RouteFederal Lands Road 20500
StateAlaska
Coordinates60.42265, -149.37697
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating21.8 US tons
Inventory rating19.3 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 20
Structure length142 ft (43.3 m)
Longest span142 ft (43.3 m)
Deck width25 ft (7.6 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (—)
Projected traffic15 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Trail River Cg RD over Trail River built?

It was built in 1965, making it 60 years old in 2025.

What condition is Trail River Cg RD over Trail 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 September 2022.

How much traffic does Trail River Cg RD over Trail River carry?

About 10 vehicles per day (latest count).

How long is Trail River Cg RD over Trail River?

The structure is 142 ft (43.3 m) long with a longest span of 142 ft (43.3 m) and a deck 25 ft wide.

Who owns Trail River Cg RD over Trail River?

It is owned by the U.S. Forest Service.