US Bridges

SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic

Fair

Ada County, Idaho · 1.7 E. Meridian · Structure no. 000000000026280

Built
1990
35 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
268 ft
2 main spans
Daily traffic
58,000
2023 count
Owner
State
State Highway Agency

About this bridge

SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic is a prestressed concrete continuous stringer/multi-beam or girder carrying SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic in Ada County, Idaho. It was built in 1990, so it is 35 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 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 58,000 vehicles a day, roughly 2% of them trucks, projected to reach 87,000 by 2042. The structure is 268 ft (81.6 m) long and 90 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSH 55;EAGLE Road
CrossesI 84 Eb-Wb;eagle RD Ic
Location1.7 E. Meridian
RouteState Highway 55
CountyAda County
StateIdaho
Coordinates43.596, -116.35478
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length268 ft (81.6 m)
Longest span132 ft (40.3 m)
Deck width90 ft (27.3 m)
Roadway width79 ft (24 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic58,000 (2023)
Projected traffic87,000 by 2042
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$4.6 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic built?

It was built in 1990, making it 35 years old in 2025.

What condition is SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic 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 SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic carry?

About 58,000 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic?

The structure is 268 ft (81.6 m) long with a longest span of 132 ft (40.3 m) and a deck 90 ft wide.

Who owns SH 55;EAGLE Road over I 84 Eb-Wb;eagle RD Ic?

It is owned by the State Highway Agency.