US Bridges

STP7220;STATE ST over Farmers Union Canal

Good

Ada County, Idaho · In Boise @ Collister · Structure no. 000000000021241

Built
2019
6 years old
Condition
Good
inspected March 2021
Type
Culvert
Concrete
Length
76 ft
2 main spans
Daily traffic
34,000
2023 count
Owner
County
County Highway Agency

About this bridge

STP7220;STATE ST over Farmers Union Canal is a concrete culvert carrying STP7220;STATE ST over Farmers Union Canal in Ada County, Idaho. It was built in 2019, so it is 6 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 34,000 vehicles a day, roughly 2% of them trucks, projected to reach 51,000 by 2042. The structure is 76 ft (23.2 m) long and 180 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSTP7220;STATE ST
CrossesFarmers Union Canal
LocationIn Boise @ Collister
RouteCounty Highway 7220
CountyAda County
StateIdaho
Coordinates43.64944, -116.24853
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating48.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length76 ft (23.2 m)
Longest span34 ft (10.4 m)
Deck width180 ft (54.9 m)
Roadway width109 ft (33.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,000 (2023)
Projected traffic51,000 by 2042
Trucks2%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 STP7220;STATE ST over Farmers Union Canal built?

It was built in 2019, making it 6 years old in 2025.

What condition is STP7220;STATE ST over Farmers Union Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2021.

How much traffic does STP7220;STATE ST over Farmers Union Canal carry?

About 34,000 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is STP7220;STATE ST over Farmers Union Canal?

The structure is 76 ft (23.2 m) long with a longest span of 34 ft (10.4 m) and a deck 180 ft wide.

Who owns STP7220;STATE ST over Farmers Union Canal?

It is owned by the County Highway Agency.