20th Street from 7th Avenue to Cliff Avenue Reconstruction

• Project value$1,775,000.00
• Contractor nameT&R Contracting, inc.
• Completion DateNovember 06, 2026

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Project Update: 06/1/2026

Construction is underway. Phase 1 has been completed. Phase 2 removals have begun.

The outside northbound lane on Cliff Avenue will be closed for one week while lighting connections are completed. A press release will be sent out prior to the lane closure.

Once Phase 2 work is complete, Phase 3 work will begin and includes the closure of 20^th Street at 9^th Avenue, which includes the cul-de-sac for Avera valet and the entrance for SFSH valet. Access for SFSH and Avera Plaza 4 will need to come from 7^th Avenue during Phase 3 of the project. A news release will be sent out prior to closure. Phase 3 is currently scheduled to begin August 12.

Work on the remainder of the project is expected to be completed in early November.

Emergency Services Access:
Emergency responders are advised to access the Avera Emergency Room from 7^th Avenue for the duration of this phase of construction. Motorists are strongly encouraged to utilize 17^th Street or 26^th Street to access 7^th Avenue.

Pedestrian Access:
Pedestrian routes will be signed, and Audible Information Devices (AIDs) will be provided to assist those navigating the detour.

Commuter Route Information

• Northbound traffic on Cliff Avenue will be reduced to one lane for one week.
• Westbound traffic on 20^th Street is reduced to a single one-way lane along the north side of the road.
• Eastbound traffic on 20^th Street is not allowed past the 9^th Avenue intersection.
• Access to the South Ramp will be maintained at all times. Access to Sioux Falls Specialty Hospital and the Avera parking ramps will remain open throughout the project, though the routes to reach them may change as work progresses. Temporary traffic signs will be posted to help guide drivers through the area. 

Project Phasing Diagram

Project Milestones

Phase 1 – North half of 20^th Street from Cliff to 9^th Avenue

1. Removals
2. Watermain
3. Grading
4. Gravel base preparation and installation
5. Concrete Paving
6. Restoration

Phase 2 – South half of 20^th Street from Cliff to 9^th Avenue

1. Removals
2. Sanitary Sewer
3. Watermain
4. Street Lighting
5. Grading
6. Gravel base preparation and installation
7. Concrete Paving
8. Restoration

Phase 3 – 9^th Avenue / SFSH Entrance Intersection

1. Removals
2. Sanitary Sewer
3. Watermain
4. Street Lighting
5. Grading
6. Gravel base preparation and installation
7. Concrete Paving
8. Restoration

Phase 4 – SFSH Exit and Avera Loading Dock Entrance

1. Removals
2. Sanitary Sewer
3. Watermain
4. Storm Drainage
5. Street Lighting
6. Grading
7. Gravel base preparation and installation
8. Concrete Paving
9. Restoration

Phase 5 – Avera Loading Dock Entrance to 7^th Avenue

1. Removals
2. Watermain
3. Storm Drainage
4. Street Lighting
5. Grading
6. Gravel base preparation and installation
7. Concrete Paving
8. Asphalt Paving
9. Restoration

General

1. Pavement Markings
2. Traffic Signage
3. Pedestrian Crossing Equipment

Construction Images