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This short video is an excerpt from the visitors center film "Crater Lake Into the Deep". Long-term Limnological Monitoring Program (LTLMP) The current LTLMP began as a ten-year study (1983-1993) to determine if Crater Lake water clarity was decreasing and to monitor and document the characteristics of Crater Lake. The goals of the current LTLMP are:
![]() NPS Crater Lake National Park has had an environmental monitoring program running continuously since 1983. The monitoring program is conducted by Crater Lake biologists and other university and government scientists. The monitoring includes:
![]() NPS Biologists also do environmental monitoring of groundwater springs and seeps inside the caldera. These springs and seeps contribute small amounts of water to Crater Lake. Springs monitoring has been conducted since 1992. The monitoring includes:
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Last updated: November 1, 2017