US Bridges

Csah 21 over I 94

Fair

Washington County, Minnesota · 8.0 MI E of JCT TH 494 · Structure no. 82848

Built
1983
42 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
290 ft
2 main spans
Daily traffic
2,600
2019 count
Owner
State
State Highway Agency

About this bridge

Csah 21 over I 94 is a steel continuous stringer/multi-beam or girder carrying Csah 21 over I 94 in Washington County, Minnesota. It was built in 1983, so it is 42 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 2,600 vehicles a day, projected to reach 2,500 by 2039. The structure is 290 ft (88.4 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCsah 21
CrossesI 94
Location8.0 MI E of JCT TH 494
RouteCounty Highway 21
CountyWashington County
StateMinnesota
Coordinates44.95482, -92.79681
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.1 US tons
Inventory rating53.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length290 ft (88.4 m)
Longest span142 ft (43.4 m)
Deck width59 ft (17.9 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2019)
Projected traffic2,500 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Csah 21 over I 94 built?

It was built in 1983, making it 42 years old in 2025.

What condition is Csah 21 over I 94 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 August 2023.

How much traffic does Csah 21 over I 94 carry?

About 2,600 vehicles per day (2019 count).

How long is Csah 21 over I 94?

The structure is 290 ft (88.4 m) long with a longest span of 142 ft (43.4 m) and a deck 59 ft wide.

Who owns Csah 21 over I 94?

It is owned by the State Highway Agency.