US Bridges

South Tongass HWY over Whitman Creek

Fair

Ketchikan Gateway Borough, Alaska · Mile Point 11.2 · Structure no. 1078

Built
1962
63 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
147 ft
3 main spans
Daily traffic
270
2020 count
Owner
State
State Highway Agency

About this bridge

South Tongass HWY over Whitman Creek is a steel continuous stringer/multi-beam or girder carrying South Tongass HWY over Whitman Creek in Ketchikan Gateway Borough, Alaska. It was built in 1962, so it is 63 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 270 vehicles a day, roughly 13% of them trucks, projected to reach 940 by 2039. The structure is 147 ft (44.8 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSouth Tongass HWY
CrossesWhitman Creek
LocationMile Point 11.2
RouteState Highway 902
StateAlaska
Coordinates55.3305, -131.5154
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating55.4 US tons
Inventory rating33.2 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length147 ft (44.8 m)
Longest span72 ft (21.9 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2020)
Projected traffic940 by 2039
Trucks13%
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

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 South Tongass HWY over Whitman Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is South Tongass HWY over Whitman 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 2023.

How much traffic does South Tongass HWY over Whitman Creek carry?

About 270 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is South Tongass HWY over Whitman Creek?

The structure is 147 ft (44.8 m) long with a longest span of 72 ft (21.9 m) and a deck 32 ft wide.

Who owns South Tongass HWY over Whitman Creek?

It is owned by the State Highway Agency.