DNR Lake Number: 70002600
Surface Area: 940 acres
Average Depth: 13 feet
Maximum Depth: 56 feet
Ordinary High Water Level: 904.0 feet above sea level
Connectivity to other waterbodies: Water flows into Lower Prior from Upper Prior. The lake level is controlled by the outlet structure which feeds the Prior Lake Outlet Channel (PLOC).
Watershed Area: 18,904 acres
Public Boat Access: Located on the northern side of the lake from Sand Point (off of Crest Avenue).
All lake level data below are approximate and preliminary – NOT to be used for legal purposes. Sudden drops or spikes are often due to calibration, which are manual adjustments to correct the lake level value. Please contact the PLSLWD office for official readings.
Note: The low-flow gate is open as of April 25, 2017.
The graph below displays the average of annual lake level readings, when available. Some years only had one lake level measurement so those would not reflect the “average” and could have been taken at any time of year. Also, some years are missing from this graph because no known data is available. The red line indicates when the weir was installed. Prior to the red line, there was no natural outlet for Prior Lake.
Estimated flow through the Prior Lake outlet structure based on past measurements of lake level and discharge. Note that the data is only valid for lake elevations between 902.5 and 903.75 and when the low-flow gate is closed. Use this table to estimate flow when low-flow gate is open. Stream discharge is calculated in cubic feet per second (cfs).
Temperature data available from March 31, 2017 onward. Sensor is located in a well roughly 1 ft below the lake bottom, so temperatures will not reflect surface conditions.
The following graphs represent the annual averages between May 1 and September 30.
- Lower Prior Diagnostic Study (2013)
Reports and Studies
- Article: Prior Lake Elevation Analysis
- Prior Lake Historic Elevations Graph 1970-2015
- 1993 Diagnostic & Feasibility Study of Spring and Prior Lakes
- 2008 Curlyleaf and Eurasian Watermilfoil Growth Potential based on Lake Sediment Characteristics for Spring, Fish, Upper Prior, and Lower Prior Lakes
- 2016 Upper and Lower Prior Lake Curlyleaf Pondweed Assessment
- 2016 Upper and Lower Prior Lake Aquatic Plant Evaluation
- 2015 Upper and Lower Prior Lake Curlyleaf Pondweed Assessment and Aquatic Plant Survey
- 2014 Upper and Lower Prior Lake Curlyleaf Pondweed Assessment
- 2013 Upper and Lower Prior Lake Curlyleaf Pondweed Assessment
- 2012 Upper and Lower Prior Lake Curlyleaf Pondweed Assessment
- 2011 Upper and Lower Prior Lake Curlyleaf Pondweed Assessment
- 2010 Upper and Lower Prior Lake Curlyleaf Pondweed Assessment