Lake Chelan annual operating range and lake level history
Lake Chelan draws thousands of visitors and residents to its shores each year. Whether the purpose is to fish, swim, boat or simply meander along its shores, the lake is a popular gathering place. It’s also a vital part of the Chelan County PUD network of hydroelectric resources. Click here for the Northwest River Forecast Center water supply forecast for Lake Chelan.
Graph lines can be turned "on" and "off" by clicking on the legend names above.
Zoom function is enabled by clicking and dragging the mouse pointer over a section of the graph
Lake levels are expected to be within the forecasted operating range most of the time.
Actual lake levels may be higher or lower than the forecasted operating range.
Click here for lake levels over the last 10 days
Future Operation (updated April 27):
The “October 1 Forecasted Operating Range” in the graph above represents the annual forecasted Operating Range for the water year (October 2015 – September 2016). The “Current Forecasted Operating Range” in the graph above represents the most recent forecasted operating range between now and the end of the water year (April 27, 2016 – Sept. 30, 2016).
The District’s April 1 Final - April – July water supply forecast is 116 percent of average. Mother Nature is having fun this year. High, early runoff is an understatement.
The District will continue to operate one unit until the overhaul of the other unit is complete, currently scheduled for return May 6. Cumulative inflows water year to date (starting Oct. 1) are either the second highest in our 65 year data set or possibly now the highest. Spill at 4,000 cfs started today. Spill will ramp back down for some biological studies early next week and then ramp back up. The lake is expected to be 1,098 or higher by the end of the first week of May.The lake level may drop some in May depending upon how and when the runoff is received. We will be well above minimum target elevations for May 1 and June 1. We expect to meet all minimum target elevations this year.
For Those on the Go
A direct link to current lake level readings is available using smart phones and tablets by scanning a QR (Quick Response) code. The code is available on posters at boat launches and marinas and rack cards distributed throughout the Chelan-Manson-Chelan Falls community.
Lake Level Management
Lake Chelan is the reservoir for the Lake Chelan Hydro Project. Managing the level of popular Lake Chelan requires balancing seven objectives in the operating license that together provide recreation, protect fish, reduce erosion and restore year-round flows to the Chelan River.
Managing the level of the lake is not an exact science. It involves a series of forecasts and calculations, with the added uncertainty of weather. However, updated tools and additional data will help us provide information that is more useful for residents and visitors.
Targeting a Range
Chelan PUD estimates that Lake Chelan can be operated within the above Current Operating Range most of the time, and meet the District’s seven license operating objectives and target elevations in most years.
We are committed to letting you know about any changes in expected lake levels as soon as we can so residents and visitors know what to expect. We welcome your comments or questions about Lake Chelan levels.
The District expects to maintain the lake level within a range of 1,084 to 1,100 feet above sea level during most years. In extremely wet years, the lake level could be lowered to 1,083 feet above sea level, or lower (the license minimum is 1,079 feet above sea level), as more room is needed to capture increased runoff. Factors that can affect lake level management include:
- High runoff due to a wet water year
- Early or late snow melt
- Project operation and/or maintenance needs
- Energy market conditions
Public Boat Ramps at Lake Chelan
We are sensitive to the needs of the many users of Lake Chelan. Below are the elevations at the bottom of each concrete boat ramp. As lake levels fluctuate, boaters are asked to take these elevations into consideration before launching a boat.
Upper lake boat launch sites map
Lower lake boat launch sites map