US Bridges

Stc 8423;LK Lowell over Deer Flat Nampa Canal

Fair

Canyon County, Idaho · 1.3 S 2.8 W Nampa · Structure no. 000000000021857

Built
1992
33 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
25 ft
1 main span
Daily traffic
6,500
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Stc 8423;LK Lowell over Deer Flat Nampa Canal is a concrete frame carrying Stc 8423;LK Lowell over Deer Flat Nampa Canal in Canyon County, Idaho. It was built in 1992, so it is 33 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 6,500 vehicles a day, roughly 2% of them trucks, projected to reach 9,750 by 2042. The structure is 25 ft (7.6 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStc 8423;LK Lowell
CrossesDeer Flat Nampa Canal
Location1.3 S 2.8 W Nampa
RouteCity Street 8423
CountyCanyon County
StateIdaho
Coordinates43.56142, -116.61667
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2023)
Projected traffic9,750 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Stc 8423;LK Lowell over Deer Flat Nampa Canal built?

It was built in 1992, making it 33 years old in 2025.

What condition is Stc 8423;LK Lowell over Deer Flat Nampa Canal 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 March 2024.

How much traffic does Stc 8423;LK Lowell over Deer Flat Nampa Canal carry?

About 6,500 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Stc 8423;LK Lowell over Deer Flat Nampa Canal?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 50 ft wide.

Who owns Stc 8423;LK Lowell over Deer Flat Nampa Canal?

It is owned by the City or Municipal Highway Agency.