Yes, very definitely spring fed. It's a VERY DANGEROUS winter time situation. Thirteen inches of ice on my little lake right now. Except over the many springs where the ice is probably one half inch or less. You never know - there is a foot of snow over the entire lake. Fall thru a spring - your final surprise for your entire life.
My lake is a small example of all the lakes in this area. Volcanic in origin - washed out my the many out washings of ancient Lake Missoula. This area is called the Channeled Scablands. The sides of the lake have zero shore line. Six inches out from those vertical volcanic cliffs it's 45 feet deep.
There is an ABSOLUTE LAW here on my property. No life vest - you aren't going to be allowed within 100 feet of my little lake. NO EXCEPTION, EVER - ANYTIME. I've offended a few parents, a few times. But rather offend than hook & drag out a floater.
Cattails are just fine. What else am I going to say - there are five acres of them down at the far end. It's where the SMART baby bass head for immediately. The others - well, they become food for the bigger bass.
Over a twelve month period - on our driest of dry years - the lake will fluctuate as much as ten inches. Only noticeable because of the "normal" white line on the volcanic cliffs. Normal being where the lake level is most of the time. Leaves a mineral deposit on the cliffs. Like a ring around the bath tub.