Swelling upkeep costs, pay raises and new debt threaten to put the Fairfax County Park Authority in the red, according to a recent report that details a “bleak” outlook for a major source of park funds.

The agency that oversees more than 23,000 acres of parks — about 9 percent of the land in the county — is on track to see expenses that “will soon begin exceeding revenue,” a draft of the Park Authority strategic plan indicated. The Authority has a $35 million revenue fund.