US Bridges

T 121 over Stream

Fair

Isanti County, Minnesota · 0.75 M S Jt TH 47 · Structure no. R0504

Built
2005
20 years old
Condition
Fair
inspected September 2023
Type
Culvert
Steel
Length
44 ft
6 main spans
Daily traffic
1
2009 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 121 over Stream is a steel culvert carrying T 121 over Stream in Isanti County, Minnesota. It was built in 2005, so it is 20 years old, younger than the Minnesota average of 38.5 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 1 vehicles a day, projected to reach 1 by 2029. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesT 121
CrossesStream
Location0.75 M S Jt TH 47
RouteCounty Highway 121
CountyIsanti County
StateMinnesota
Coordinates45.54695, -93.38886
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating28.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans6
Design loadHS 25 or greater
Structure length44 ft (13.4 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2009)
Projected traffic1 by 2029
Trucks—
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

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$1,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T 121 over Stream built?

It was built in 2005, making it 20 years old in 2025.

What condition is T 121 over Stream 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 September 2023.

How much traffic does T 121 over Stream carry?

About 1 vehicles per day (2009 count).

How long is T 121 over Stream?

The structure is 44 ft (13.4 m) long with a longest span of 6 ft (1.8 m).

Who owns T 121 over Stream?

It is owned by the Town or Township Highway Agency.