What? Stream temperatures on third order streams in Cape Breton Highlands National Park are being monitored to determine if mean water temperatures are changing over time. When? Monitoring frequency occurs annually from June 15th to September 15th on various park streams. How? Water temperature data loggers are deployed in selected park streams in the spring of each year and are retrieved in the fall. The loggers are programmed to record hourly water temperatures over the period of deployment and the results are downloaded at the end of the deployment period. Why? Water temperature can be used to detect landscape level changes due to issues such as hydroelectric development, thermal pollution, and deforestation. Water temperature also represents a direct indicator of the effects of climate change on aquatic environments.