Total Assets
$197.0M
Total Deposits
$174.2M
Branches
8
Established
1955
SENTINEL is a credit union headquartered in BOX ELDER, South Dakota, established in 1955. It holds $197.0M in total assets across 8 branch locations. In our editorial opinion, based on public FDIC/NCUA data, SENTINEL earns a TFS Financial Health Grade of C (67.8/100) — our editorial assessment, not an official rating or financial advice.
TFS Health Grade
67.8 / 100
Average financial health
How we gradeTFS Health Grades are our editorial opinion based on public FDIC/NCUA data — not an official rating, not financial advice.
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Financial data through March 31, 2026. Updated by TFS August 28, 2026. Data sourced from NCUA Call Reports as of 2026-Q1. This data is provided by the federal government and is believed to be accurate, but TheFinanceSection.com cannot guarantee its completeness or timeliness.
Data sourced from CFPB Consumer Complaint Database. This data is provided by the federal government and is believed to be accurate, but TheFinanceSection.com cannot guarantee its completeness or timeliness.
| Branch | Address | City | State | Type |
|---|---|---|---|---|
| MainHQ | 2723 LeMay Blvd | Ellsworth AFB | SD | Full Service |
| Liberty Branch | 441 N Ellsworth Rd | Box Elder | SD | Full Service |
| Radar Hill Branch | 22752 Mule Deer Trl | Box Elder | SD | Full Service |
| Custer Office | 18 Mount Rushmore Rd | Custer | SD | Full Service |
| Hill CIty Office | 553 E Main St | Hill City | SD | Full Service |
| Haines | 1430 Haines Ave Ste 101 | Rapid City | SD | Full Service |
| Triple Crown | 4011 Triple Crown Dr | Rapid City | SD | Full Service |
| Winner | 511 E 2nd St | Winner | SD | Full Service |
Data sourced from FDIC BankFind Suite. This data is provided by the federal government and is believed to be accurate, but TheFinanceSection.com cannot guarantee its completeness or timeliness.
Data sourced from FDIC Enforcement Decisions and Orders / NCUA. This data is provided by the federal government and is believed to be accurate, but TheFinanceSection.com cannot guarantee its completeness or timeliness.
TFS Financial Health Grades represent our editorial assessment based on publicly available data and our proprietary methodology. They do not represent financial advice or an official government rating. Data on this page is sourced from federal government databases and is believed to be accurate.
Benchmarked against 60 active, federally insured credit unions reporting in the same quarter and holding roughly 0.5×–2× its assets. Same-state and overlapping-market peers are prioritized.
TFS health score
67.8
Net worth ratio
10.78%
Return on assets
0.56%
60+ day delinquency
0.33%
Suggested direct comparisons
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Complaint percentiles are intentionally withheld while TFS audits CFPB company matching and import coverage. Peer conclusions use complete same-quarter regulatory metrics only.