You are right, I will redo the math I picked the wrong denominator when I was doing the percentages. Note the hourly calculations are used for determining peak use. Therefore you cant equate peak hour use to yearly use
They did not use the same format for each use, hikers are based on 5 hours of use while cog is based on 10 hours and they do not state how many hours for the autoroad.
Max Hourly Cog - 280 from pdf
Autoroad Hourly - 525 from pdf
Hikers hourly - 53 from pdf
Total Hourly - 853 (I added them up)
Total summit usage 315,000 with hikers at 80,000 (25%). They do not break out if the hiker usage is the summit museum or the summit in general.
Of course the Cog has stated that they plan to increase volume substantially going forward ultimately by adding a second complete track. I do not think they can double ridership with this change as they now have automated switches and sidings but there will be an increase. They claimed in front of the Coos County Planning board last year that they currently are limited by peak unload and loading capability at the summit and had proposed to substantially increase that capability by reclaiming long abandoned track within the state owned summit circle. They can not pursue that project unless the state signs off and the autoroad has objected as the Cog expansion would impact the autoroad guests access to the summit and in general complicate operations at the summit as the road to the summit circle used for supplies and handicapped access would be pinched down substantially.
Mike Pelchat when he was manager had observed that the existing wastewater disposal system had problems with surge use especially in early season. The biological systems in the system are temperature dependent and expand or contract their population dependent on usage. The "bugs are less active in cold conditions so early season weekends tend to overwhelm the system as the "bugs" are not adequately present to process the weekend surge in wasteflow. He was advocating opening the summit building to hikers on a limited basis prior to the autoroad or cog to slowly ramp up waste volume to get the system ready for the big surges when the cog and autoroad open. At some point the bugs are not the limiting factor, there are usually settling chambers to allow solids to drop out of the waste stream, if the surge flows exceed design velocity, solids get swept into the secondary treatment portion of the system that is designed for liquids and this can permanently reduce the capacity of the system.
The cog has announced they are going to be running to summit earlier but I am do not know how the logistics would work as the summit operations are predominantly supported by the autoroad. The cog did announce two years ago that they were considering building a "potty car" to haul up to the summit. I do not know if they did but presume it was just a way of getting around having to shoulder capital costs for upgrades at the summit.