US Bridges

US 20; Franklin RD over I 84;FRANKLIN RD Ic

Good

Canyon County, Idaho · At Caldwell Ecl · Structure no. 000000000012226

Built
2008
17 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
336 ft
2 main spans
Daily traffic
19,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 20; Franklin RD over I 84;FRANKLIN RD Ic is a steel continuous stringer/multi-beam or girder carrying US 20; Franklin RD over I 84;FRANKLIN RD Ic in Canyon County, Idaho. It was built in 2008, so it is 17 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 19,000 vehicles a day, roughly 4% of them trucks, projected to reach 28,500 by 2042. The structure is 336 ft (102.4 m) long and 103 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 20; Franklin RD
CrossesI 84;FRANKLIN RD Ic
LocationAt Caldwell Ecl
RouteU.S. Route 20
CountyCanyon County
StateIdaho
Coordinates43.66278, -116.66056
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length336 ft (102.4 m)
Longest span163 ft (49.7 m)
Deck width103 ft (31.5 m)
Roadway width87 ft (26.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,000 (2023)
Projected traffic28,500 by 2042
Trucks4%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 US 20; Franklin RD over I 84;FRANKLIN RD Ic built?

It was built in 2008, making it 17 years old in 2025.

What condition is US 20; Franklin RD over I 84;FRANKLIN RD 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 September 2024.

How much traffic does US 20; Franklin RD over I 84;FRANKLIN RD Ic carry?

About 19,000 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 20; Franklin RD over I 84;FRANKLIN RD Ic?

The structure is 336 ft (102.4 m) long with a longest span of 163 ft (49.7 m) and a deck 103 ft wide.

Who owns US 20; Franklin RD over I 84;FRANKLIN RD Ic?

It is owned by the State Highway Agency.