Deuel Vocational Institution (DVI) was a state prison located in unincorporated San Joaquin County, California, near Tracy.

[4][5][6][7][8][9][10][11] DVI opened in 1953 and named for California state senator Charles H. Deuel, who sponsored legislation establishing the institution.

The facility also housed "mainline" inmates classified by CDCR as levels II and III.

As of January 2006, the total count of prisoners at DVI was 3,748, with 3,162 of that number assigned to the reception center.

They grew cattle grain and supply milk to other state prisons and tax-supported public agencies.