Iowa Code § 626.20: Entry on encumbrance book.

If real estate is levied upon, except by virtue of a special execution issued in cases foreclosing recorded liens, the officer making the levy shall make an entry in the encumbrance book in the office of the clerk of the district court of the county where the real estate is located, which entry shall constitute notice to all persons of such levy. Such entry shall contain the number and title of the case, date of levy, date of the entry, amount claimed, description of the real estate levied upon, and signature of the officer.