US Bridges

Csah 21 over Stream

Fair

Washington County, Minnesota · 3.4 MI S of JCT Csah 20 · Structure no. 82509

Built
1980
45 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
79 ft
2 main spans
Daily traffic
1,277
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over Stream is a prestressed concrete tee beam carrying Csah 21 over Stream in Washington County, Minnesota. It was built in 1980, so it is 45 years old, older 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 1,277 vehicles a day, projected to reach 1,200 by 2042. The structure is 79 ft (24 m) long and 48 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCsah 21
CrossesStream
Location3.4 MI S of JCT Csah 20
RouteCounty Highway 21
CountyWashington County
StateMinnesota
Coordinates44.8, -92.8063
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
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
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating36.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length79 ft (24 m)
Longest span38 ft (11.6 m)
Deck width48 ft (14.6 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,277 (2022)
Projected traffic1,200 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Stream built?

It was built in 1980, making it 45 years old in 2025.

What condition is Csah 21 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 October 2024.

How much traffic does Csah 21 over Stream carry?

About 1,277 vehicles per day (2022 count).

How long is Csah 21 over Stream?

The structure is 79 ft (24 m) long with a longest span of 38 ft (11.6 m) and a deck 48 ft wide.

Who owns Csah 21 over Stream?

It is owned by the County Highway Agency.