When I read the application in 2011 (time flies!) this was my interpretation of the impact it would have on hikers that needed to use the Tangle Falls parking lot. Obviously my interpretation may have been incorrect and they may have changed their plans since their application was made.
"- During operating hours, the Sunwapta Canyon Viewpoint parking lot will be closed to all traffic and reserved exclusively for Brewsters buses. After hours, a small handful of cars may park there.
- An 800m trail will be constructed between Sunwapta Canyon Viewpoint and the Tangle Falls parking lot. This will allow people to park at Tangle Falls to then check out the Glacier Discovery Walk or the enhanced free public viewing area. Surely, this will be a stop on many people's trips if a stall is available and the demand for spots at Tangle Falls will increase by many orders of magnitude.
- It sounds like they are planning for capacity of 5000 people per day through the Glacier Discovery Walk with a visit time of about 60 minutes each. If someone parks at Tangle Falls, I estimate they would be there for about 80 minutes (10 minute walk each way.) With 25 stalls and two people per vehicle, that means that the Tangle Falls parking lot can handle about 338 visitors/day to the Glacier Discovery Walk. The rest will have to park at the Glacier Discover Centre and take the bus. It seems likely that the Tangle Falls parking lot will be completely saturated by visitors to the new Brewsters attraction and it would be incredibly unlikely to find a free parking spot. To make matters worse, they won't be able to use the Sunwapta Canyon Viewpoint parking lot as a back-up since it will now be closed to cars. If parking is not available at Tangle Falls, visitors can drive to the Glacier Discover Center and ride the bus back to the Sunwapta Canyon Viewpoint(during 9-6.)"