US Bridges

N 175 E RD over Eagle Rock Cnl Headgate

Fair

Jefferson County, Idaho · 0.2 S. 4.4 E. Ririe · Structure no. 000000000032351

Built
1997
28 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
38 ft
2 main spans
Daily traffic
40
2023 count
Owner
Private
Private (other than railroad)

About this bridge

N 175 E RD over Eagle Rock Cnl Headgate is a concrete culvert carrying N 175 E RD over Eagle Rock Cnl Headgate in Jefferson 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 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 60 by 2039. The structure is 38 ft (11.6 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesN 175 E RD
CrossesEagle Rock Cnl Headgate
Location0.2 S. 4.4 E. Ririe
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.62833, -111.68578
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width35 ft (10.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic60 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerPrivate (other than railroad)
Maintained byPrivate (other than railroad)
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N 175 E RD over Eagle Rock Cnl Headgate built?

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

What condition is N 175 E RD over Eagle Rock Cnl Headgate 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 March 2023.

How much traffic does N 175 E RD over Eagle Rock Cnl Headgate carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is N 175 E RD over Eagle Rock Cnl Headgate?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 35 ft wide.

Who owns N 175 E RD over Eagle Rock Cnl Headgate?

It is owned by the Private (other than railroad).