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 – NEW!

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 BranchNOW OPEN!
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 N Haines Ave, Suite 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 & Drive-Up Hours: Mon – Fri 9:00 am – 5:00 pm (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)

To Report Lost or Stolen Cards

If your Sentinel Federal card is lost or you believe it has been stolen, call us immediately at the appropriate number below.

During Normal Business Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Phone: 605-923-1405 / 888-923-1400

After Business Hours:
ATM Cards: 800-472-3272
Debit Cards: 800-682-6075
Credit Cards: 800-543-5073

Shared Branching

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