Lake Information

Save Our Lake!

What YOU can do to preserve the water quality of TWIN LAKES. While there is never an easy answer or quick fix to protect our lake, there are a number of simple things that we can do AND promote with our lake neighbors. Understanding how our actions affect the long term health of our lake helps current and future generations protect the lifestyle and value of our lake and environment. Limiting phosphorus entering the lake is the key to controlling the growth of algae, excessive aquatic plants and improving water clarity, oxygen content and water quality in general. Consider placing a copy at your cabins and homes on the lakes.

Lake Do’s and Don’ts

Do’s include:

  1. Use zero-phosphorus lawn fertilizer
  2. Properly operate and maintain septic systems; pump at least every three years for year-round residents, or 5 years for seasonal residents
  3. Use phosphorous-free dishwasher & laundry detergents
  4. Clean up pet waste
  5. Keep bonfires away from the lake, and clean up all ashes
  6. Pick up fireworks debris and residue
  7. Ensure your boat engine and gas tank have no fluid leaks. (Consider using a small hand pump or other devices to transfer gas from containers to your boat to avoid spills.)
  8. Cover loose soil areas with vegetation and remedy any shoreline erosion problems
  9. Develop and maintain a shoreline vegetation buffer
  10. Remove seaweed and vegetation from around your dock and swimming area.

Don’ts include:

  1. Don’t add sand along the shoreline- (Sand contains high amounts of phosphorus and destroys the natural filters we need to keep the lake healthy.)
  2. Don’t bathe, shampoo, or wash boats, pets, or other objects in the lake
  3. Do not fertilize within 30 feet of the lake (From 30 feet to 250 feet, use no phosphate, slow release nitrogen fertilizer on vegetated areas.)
  4. Don’t feed the ducks and geese (Resident duck and goose populations increase disease-causing bacteria in the water. They can also be a significant source of nutrients to the lake.)
  5. Don’t put leaves, grass clippings, branches or any kind of organic matter into the lake (Plant debris adds phosphorus and other nutrients directly to the lake.)

Migrating Quagga Mussels & Idaho Inspection Stations

A New population of Quagga mussels was discovered in Canyon Lake, Arizona. This is an area of water circulation, therefore, all the adjoining reservoirs potentially have them. Arizona has a limited prevention program and all boats traveling from Arizona are considered high risk for the transportation of these mussels to other lake systems.

Idaho intercepts and decontaminates more boats compared to any other Northwest state. Data for 2015 showed 25 fouled watercraft were intercepted with 17 destined for Idaho. 11 boats were out of a fouled waterbody for less than 30 days. Eighteen had been recently purchased, 14 were commercially transported and 16 gave prior arrival notification.

Incoming data for the month of May 2016 shows five fouled watercraft coming from Lake Havasu, Arizona and intercepted at the Hwy 93 station. Boat owners on Twin Lakes who take their boats to other lakes should ensure the boat gets cleaned to prevent cross-contamination between Lakes. It is also important to get all weeds off as well. Currently, Twin Lakes is free from mussels and Eurasian Milfoil. Let’s keep it that way.


What is the boating speed for upper and lower Twin Lakes?

Lower Twin is 35 mph during the day and 20 mph at night.
Upper Twin is 50 mph during the day and 20 mph at night.

Floating Things on Kootenai County Lakes