US Bridges

STC4755;TAMMANY CR over Tammany Creek

Fair

Nez Perce County, Idaho · 0.3 S. Lewiston Scl · Structure no. 000000000021473

Built
1987
38 years old
Condition
Fair
inspected September 2023
Type
Frame
Concrete
Length
36 ft
2 main spans
Daily traffic
2,700
2023 count
Owner
County
County Highway Agency

About this bridge

STC4755;TAMMANY CR over Tammany Creek is a concrete frame carrying STC4755;TAMMANY CR over Tammany Creek in Nez Perce County, Idaho. It was built in 1987, so it is 38 years old, younger than the Idaho average of 45.3 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 2,700 vehicles a day, roughly 33% of them trucks, projected to reach 4,050 by 2042. The structure is 36 ft (11 m) long and 49 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesSTC4755;TAMMANY CR
CrossesTammany Creek
Location0.3 S. Lewiston Scl
RouteCounty Highway 4755
CountyNez Perce County
StateIdaho
Coordinates46.35861, -116.92197
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating22 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length36 ft (11 m)
Longest span17 ft (5.2 m)
Deck width49 ft (14.8 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2023)
Projected traffic4,050 by 2042
Trucks33%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC4755;TAMMANY CR over Tammany Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is STC4755;TAMMANY CR over Tammany 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 September 2023.

How much traffic does STC4755;TAMMANY CR over Tammany Creek carry?

About 2,700 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is STC4755;TAMMANY CR over Tammany Creek?

The structure is 36 ft (11 m) long with a longest span of 17 ft (5.2 m) and a deck 49 ft wide.

Who owns STC4755;TAMMANY CR over Tammany Creek?

It is owned by the County Highway Agency.