US Bridges

N 4100 E RD (milo) over Burgess Cnl;se.Rigby Br

Fair

Jefferson County, Idaho · 0.2 S. 1.5 E. Rigby · Structure no. 000000000032530

Built
1969
56 years old
Condition
Fair
inspected March 2023
Type
Channel Beam
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
1,400
2023 count
Owner
County
County Highway Agency

About this bridge

N 4100 E RD (milo) over Burgess Cnl;se.Rigby Br is a prestressed concrete channel beam carrying N 4100 E RD (milo) over Burgess Cnl;se.Rigby Br in Jefferson County, Idaho. It was built in 1969, so it is 56 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 1,400 vehicles a day, roughly 19% of them trucks, projected to reach 2,100 by 2042. The structure is 48 ft (14.6 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN 4100 E RD (milo)
CrossesBurgess Cnl;se.Rigby Br
Location0.2 S. 1.5 E. Rigby
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.66592, -111.88414
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length48 ft (14.6 m)
Longest span47 ft (14.3 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic2,100 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$460,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 4100 E RD (milo) over Burgess Cnl;se.Rigby Br built?

It was built in 1969, making it 56 years old in 2025.

What condition is N 4100 E RD (milo) over Burgess Cnl;se.Rigby Br 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 4100 E RD (milo) over Burgess Cnl;se.Rigby Br carry?

About 1,400 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is N 4100 E RD (milo) over Burgess Cnl;se.Rigby Br?

The structure is 48 ft (14.6 m) long with a longest span of 47 ft (14.3 m) and a deck 28 ft wide.

Who owns N 4100 E RD (milo) over Burgess Cnl;se.Rigby Br?

It is owned by the County Highway Agency.