US Bridges

T 18 over Stanchfield Brook

Fair

Isanti County, Minnesota · 0.2 MI W of JCT Csah 14 · Structure no. 97351

Built
1993
32 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
31 ft
2 main spans
Daily traffic
135
1993 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 18 over Stanchfield Brook is a concrete culvert carrying T 18 over Stanchfield Brook in Isanti County, Minnesota. It was built in 1993, so it is 32 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 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 135 vehicles a day, projected to reach 135 by 2029. The structure is 31 ft (9.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesT 18
CrossesStanchfield Brook
Location0.2 MI W of JCT Csah 14
RouteCounty Highway 18
CountyIsanti County
StateMinnesota
Coordinates45.70211, -93.30222
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.8 US tons
Inventory rating43.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length31 ft (9.6 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic135 (1993)
Projected traffic135 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was T 18 over Stanchfield Brook built?

It was built in 1993, making it 32 years old in 2025.

What condition is T 18 over Stanchfield Brook 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 2024.

How much traffic does T 18 over Stanchfield Brook carry?

About 135 vehicles per day (1993 count).

How long is T 18 over Stanchfield Brook?

The structure is 31 ft (9.6 m) long with a longest span of 13 ft (3.9 m).

Who owns T 18 over Stanchfield Brook?

It is owned by the Town or Township Highway Agency.