US Bridges

Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic

Good

Ada County, Idaho · 3.0 E. Boise · Structure no. 000000000015778

Built
1997
28 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
272 ft
2 main spans
Daily traffic
1,100
2023 count
Owner
State
State Highway Agency

About this bridge

Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic is a prestressed concrete continuous stringer/multi-beam or girder carrying Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic in Ada County, Idaho. It was built in 1997, so it is 28 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,100 vehicles a day, projected to reach 1,650 by 2042. The structure is 272 ft (82.8 m) long and 94 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSma 9423;EISENMAN
CrossesI 84;ISAACS Canyon Ic
Location3.0 E. Boise
RouteCounty Highway 9423
CountyAda County
StateIdaho
Coordinates43.50761, -116.1435
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length272 ft (82.8 m)
Longest span132 ft (40.2 m)
Deck width94 ft (28.7 m)
Roadway width91 ft (27.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,650 by 2042
Trucks0%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic built?

It was built in 1997, making it 28 years old in 2025.

What condition is Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic 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 October 2023.

How much traffic does Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic carry?

About 1,100 vehicles per day (2023 count).

How long is Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic?

The structure is 272 ft (82.8 m) long with a longest span of 132 ft (40.2 m) and a deck 94 ft wide.

Who owns Sma 9423;EISENMAN over I 84;ISAACS Canyon Ic?

It is owned by the State Highway Agency.