Adirondack Lake Survey

Anyone know if lake pH is checked regularly by a scientists (not that I don't trust my pool strips - guess I could try those!)? I found a 1986 survey of fish, shoreline, geography, etc: http://www.adirondacklakessurvey.org/alscrpt.php?alscpond=040617. Chasing links, I see USGS has some 1955 photos from 12,000 feet, but quality is about the same as they used for bombing German factories ten years prior to that, so hard to read any details.