A Presbyterian youth camp along the Blanco River that was damaged in the floods of 2015 has launched a fundraising drive inspired by a pledge from an anonymous donor to match all donations up to $400,000 that come in by the end of next year.

“Light the Match,” as the campaign is being called, would fund the rebuilding of cabins, bathrooms and other facilities at John Knox Ranch Camp in Fischer that were destroyed by the floods, as well as replenish the camp’s scholarship fund an...