US Bridges

Csah 21 over Trout Brook

Fair

Washington County, Minnesota · 1.0 MI N of JCT Csah 20 · Structure no. 82508

Built
2000
25 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
1,050
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over Trout Brook is a prestressed concrete stringer/multi-beam or girder carrying Csah 21 over Trout Brook in Washington County, Minnesota. It was built in 2000, so it is 25 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 1,050 vehicles a day, projected to reach 860 by 2038. The structure is 76 ft (23.1 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCsah 21
CrossesTrout Brook
Location1.0 MI N of JCT Csah 20
RouteCounty Highway 21
CountyWashington County
StateMinnesota
Coordinates44.86375, -92.8013
Functional classRural 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating76.7 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length76 ft (23.1 m)
Longest span71 ft (21.7 m)
Deck width36 ft (11 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (2018)
Projected traffic860 by 2038
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

OwnerCounty Highway Agency
Maintained byCounty 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 Csah 21 over Trout Brook built?

It was built in 2000, making it 25 years old in 2025.

What condition is Csah 21 over Trout 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 October 2024.

How much traffic does Csah 21 over Trout Brook carry?

About 1,050 vehicles per day (2018 count).

How long is Csah 21 over Trout Brook?

The structure is 76 ft (23.1 m) long with a longest span of 71 ft (21.7 m) and a deck 36 ft wide.

Who owns Csah 21 over Trout Brook?

It is owned by the County Highway Agency.