Geographically paired lake-reservoir dataset derived from the 2007 USA EPA National Lakes Assessment
Laboratory and field methods for the NLA data are reported by the US Environmental Protection Agency (https://www.epa.gov/national-aquatic-resource-surveys/national-lakes-assessment-2007-results). We used the NLA data directly to collect basic geographic and morphometric parameters (elevation, catchment area, lake area, lake perimeter, maximum depth) and physical parameters (Secchi disk depth, turbidity, chlorophyll, surface water temperature, bottom water temperature). Mean residence times were provided by Renée Brooks (pers. communication) and were estimated using stable isotopes of hydrogen and oxygen as described in Brooks et al. (2014). If more than one parameter was collected for a site, then the average among the values was used in the analysis. From these parameters, we also calculated the ratio of catchment area to surface area (CA:SA) and depth-corrected difference in temperature between the surface and bottom waters.