Flathead Valley's state parks see record-setting visitation numbers and last updated 2020-12-30 20:38:16-05 KALISPELL â While normal day-to-day activities were severely impacted in 2020 due to COVID-19, Montana State Parks in the Flathead Valley saw record-setting visitation numbers. Flathead Lake State Park -- which consists of six unique park units -- was the most visited park in Montana in 2020 with more than 439,000 visitors. It also saw a 33.5% increase in visitors between January and September. Meanwhile, Les Mason State Park in Whitefish saw a drastic increase in visitors reporting a 38.7% jump. Lone Pine State Park in Kalispell was the stateâs seventh most visited park in 2020 seeing a 17.5% in visitors through September.