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Q:  I am in a discussion with staff on field markings. They believe hash marks, the lines showing each yard, are not required for HS games. I cannot see anything that says they are. Are they required? 

A:  Horizontal yard lines are not required.  Only a vertical hash at each five yard line in addition to the hash or numbers nine yards in at every 10 yard line.

P. 13 of the Football Rule Book:  

e. A series of “hash marks” should be 24 inches in length and 4  inches in width and shall be located 53 feet, 4 inches from and parallel with each sideline dividing the field of play longitudinally in thirds. The lines shall be marked so that each 5-yard line bisects the hash mark.
NOTES:
1. Game administration may place on the field of play, with the inner edge of the extension in line with the outer edge of the hash mark, yard-line extensions that should be 24 inches in length and 4 inches in width.

f. Nine-yard marks, 12 inches in length and 4 inches in width, shall be located 9 yards from each sideline. The 9-yard marks shall be marked so that at least each successive 10-yard line bisects the 9-yard marks. These marks shall not be required if the field of play is visibly numbered. If on-the-field numbers are used, the tops of those numbers shall be 9 yards from the
sideline, should be 6 feet in height and 4 feet in width and may include directional arrows next to the yard-line numbers indicating the direction toward the nearest goal line.

http://www.wiaawi.org/Portals/0/PDF/Sports/Football/footballfielddiagram.pdf