This is what you want to be monitoring -
The Dept of the Treasury
Monthly Treasury Statement (MTS)
Jan 2017 - Feb is not out yet.
https://www.fiscal.treasury.gov/fsreports/rpt/mthTreasStmt/mts0117.pdf
Historical statements -
https://www.fiscal.treasury.gov/fsreports/rpt/mthTreasStmt/backissues.htm