US Bridges

Emerald Street over I 184B E-W;emerald ST Gs

Fair

Ada County, Idaho · 0.2 M.W.Boise Wcl;emerald · Structure no. 000000000025985

Built
1968
57 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
291 ft
4 main spans
Daily traffic
12,500
2023 count
Owner
State
State Highway Agency

About this bridge

Emerald Street over I 184B E-W;emerald ST Gs is a prestressed concrete stringer/multi-beam or girder carrying Emerald Street over I 184B E-W;emerald ST Gs in Ada County, Idaho. It was built in 1968, so it is 57 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 6 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 12,500 vehicles a day, roughly 2% of them trucks, projected to reach 18,750 by 2042. The structure is 291 ft (88.7 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesEmerald Street
CrossesI 184B E-W;emerald ST Gs
Location0.2 M.W.Boise Wcl;emerald
RouteCounty Highway 0
CountyAda County
StateIdaho
Coordinates43.612, -116.26675
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length291 ft (88.7 m)
Longest span89 ft (27 m)
Deck width40 ft (12.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,500 (2023)
Projected traffic18,750 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.9 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Emerald Street over I 184B E-W;emerald ST Gs built?

It was built in 1968, making it 57 years old in 2025.

What condition is Emerald Street over I 184B E-W;emerald ST Gs 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 August 2023.

How much traffic does Emerald Street over I 184B E-W;emerald ST Gs carry?

About 12,500 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Emerald Street over I 184B E-W;emerald ST Gs?

The structure is 291 ft (88.7 m) long with a longest span of 89 ft (27 m) and a deck 40 ft wide.

Who owns Emerald Street over I 184B E-W;emerald ST Gs?

It is owned by the State Highway Agency.