Locations & Hours

ATM Locations:

You may access your account, fee-free, by using your Sentinel Federal ATM card or Debit Card at the following Sentinel Federal-owned ATMs:

Rapid City, SD
Drive-Up ATM: Haines Branch – 1430 N Haines Ave
Drive-Up ATM: Triple Crown Branch – 4011 Triple Crown Dr

Ellsworth AFB, SD
Drive-Up ATM: Located in BX Parking Lot
Walk-Up ATM: Located in Shoppette

Box Elder, SD
Drive-Up ATM: 447 North Ellsworth Road (next to Villa Car Wash)
Drive-Up ATM: Radar Hill Road Branch – 22752 Mule Deer Trail

Mailing Address:

Sentinel Federal Credit Union
PO Box 700
Box Elder SD 57719

Branch Locations & Hours:

Main Office
On Ellsworth AFB connected to BX
Mail: PO Box 700 – Box Elder SD 57719
Phone: 605-923-1405 / 888-923-1400
Fax: 605-923-3960
Overseas DSN: 675-6303
Call Center Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Lobby Hours: Mon – Fri 9:00 am – 5:00 pm (MT)
Contact Us

Radar Hill Road Branch 
22752 Mule Deer Trail – Box Elder SD 57719
Mail: PO Box 700 – Box Elder SD 57719
Phone: 605-923-1405 / 888-923-1400
Fax: 605-791-5511
Overseas DSN: 675-6303
Call Center Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Lobby Hours: Mon – Fri 9:00 am – 5:00 pm (MT)
Drive-Up: Mon – Fri 7:30 am – 5:30 pm (MT) / Saturday 9:00 am – Noon (MT)

Haines Branch
1430 Haines Ave Ste 101 – Rapid City, SD 57701
Phone: 605-923-1405 / 888-923-1400
Fax: 605-348-8047
Call Center Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Lobby Hours: Mon – Fri 9:00 am – 5:00 pm (MT)
Drive-Up: Mon – Fri 7:30 am – 5:30 pm (MT) / Saturday 9:00 am – Noon (MT)

Triple Crown Branch
4011 Triple Crown Dr – Rapid City, SD 57701
Phone: 605-923-1405 / 888-923-1400
Fax: 605-342-2055
Call Center Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Lobby Hours: Mon – Fri 9:00 am – 5:00 pm (MT)
Drive Up: Mon – Thurs 8:00 am – 5:00 pm (MT) / Fri 8:00 am – 5:30 pm (MT) / Saturday 9:00 am – Noon (MT)

Winner Branch
757 W 2nd St – Winner, SD 57580
Mail: PO Box 87 – Winner, SD 57580
Phone: 605-842-3581 / 888-923-1400
Fax: 605-842-1370
Lobby Hours: Mon – Fri 8:30 am – 3:30 pm (CT)
Drive-Up: Mon – Fri 8:00 am – 3:30 pm (CT)

Lost, Stolen or Blocked Cards:

During Normal Business Hours (8 am – 5 pm MT Mon – Fri):
605-923-1405 or 888-923-1400

After Business Hours:

  • ATM Cards:
    • Sentinel FCU: 800-472-3272
  • Debit Cards:
    • Sentinel FCU: 800-682-6075
    • Rapid City Telco FCU: 800-236-2442
  • Credit Cards:
    • Sentinel FCU: (Lost/Stolen) 800-543-5073; (Blocked) 866-334-1048
    • Rapid City Telco FCU: 800-808-7230

Shared Branching

Shared Branching gives you convenient access to your credit union accounts at over 185 credit union locations. Get details