US Bridges

SMA3733;DEER Flat over Hubbard Creek

Fair

Ada County, Idaho · 0.8 N. 3.7 E. Kuna · Structure no. 000000000026025

Built
1976
49 years old
Condition
Fair
inspected November 2023
Type
Frame
Concrete
Length
33 ft
2 main spans
Daily traffic
1,400
2023 count
Owner
County
County Highway Agency

About this bridge

SMA3733;DEER Flat over Hubbard Creek is a concrete frame carrying SMA3733;DEER Flat over Hubbard Creek in Ada County, Idaho. It was built in 1976, so it is 49 years old, older 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 5 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 1,400 vehicles a day, roughly 1% of them trucks, projected to reach 2,100 by 2042. The structure is 33 ft (10.1 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSMA3733;DEER Flat
CrossesHubbard Creek
Location0.8 N. 3.7 E. Kuna
RouteCounty Highway 3733
CountyAda County
StateIdaho
Coordinates43.50275, -116.34653
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span16 ft (4.9 m)
Deck width40 ft (12.2 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic2,100 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$545,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SMA3733;DEER Flat over Hubbard Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is SMA3733;DEER Flat over Hubbard 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 November 2023.

How much traffic does SMA3733;DEER Flat over Hubbard Creek carry?

About 1,400 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is SMA3733;DEER Flat over Hubbard Creek?

The structure is 33 ft (10.1 m) long with a longest span of 16 ft (4.9 m) and a deck 40 ft wide.

Who owns SMA3733;DEER Flat over Hubbard Creek?

It is owned by the County Highway Agency.