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Periods of Record

The period of record for a monitoring site or location is the time period for which regular samples have been collected. The period of record for data collected at the currently monitored sites can be accessed from the agency conducting the subject monitoring. For example, the United States Geological Survey (USGS) site at Tracy (Truckee River at Tracy) has been continuously (recorded every 15 minutes) collecting gage height (feet) and discharge (cubic feet per second) for 13 years (1997 – 2010) (See station information in Appendix A).