Getting water up 100 feet + 300 more from river

We live in Eastern Tennessee on a cliff above a river.
I would love to be able to pump river water up for my raised garden bed and small orchard.
It's basically straight down and then about 300 more feet to the water.  The river curves and silt has built a flat floodplain beneath our cliff.  
I cannot leave a submersible pump in the water because we have a few kayakers and rare boats.  I do not want it to disappear.
I've looked into treadle pumps but was informed that they cannot pump more than 25-35 feet.  Manual pumps interest me because of the exercise aspect.  I would look into solar but believe this still would require a submersible pump.
Any ideas I would definitely appreciate.

Two possibilities?

-Build a small cement "box" with lockable lid, at edge of river. Put pump in it.
-Check out if you could use a (non-electric) hydraulic ram pump. They were commonly used before electricity.

Balancing effort and effectiveness I would like to second Jim's idea of a secure storage thing to hold the pump when not in use.

Lift is a heck of a thing to overcome and the more severe the drop the harder it is to move liquid. A powered pump, in my opinion, makes the most sense for your application.

I am actually trying to do the same thing, or at least lift the same height.

So far I haven't bought anything because I am just doing other projects but I am strongly leaning towards a small hose into a holding tank on top of the hill. I want to look into solar power well pumps. My buddy has one that is probably only 1/4" hose but it pumps all day from 200 feet down into a 1500 gallon tank and he always has water it seems. I just think the power needed to pump much faster up 120ft is going to be too expensive!

I like the idea of a tamper proof box.

I like the pump in a locked concrete box/catchment tank idea. My Grundfos pump moves between 2gal (with a single solar panel) and 5gal (w auxiliary generator) per minute up about 200’ vertical over about a 1/2mi run. It is pretty amazing. In your situation it seems to me it may be necessary to find a more gradual path for the pipe, and to stage another catchment tank and pump halfway up. However, as I have thought about the logistics of how my system was built by the prior owner of the property, it makes digging ponds on the high points of the property and rain catchment for any roof, then pumping it up a shorter run for gravity fed pressure seem like a piece of cake.

1HP JET pump will do pull water up 110ft, so you can have the pump on your property.
https://www.homedepot.com/p/K2-PRO-1-HP-Heavy-Duty-Cast-Iron-Convertible-Deep-Well-Jet-Pump-WPD10001K/314211777

Or you can just "cover" the pump at foot of the cliff, so prying eyes can even tell it is there. Then run another pipe the 300ft to the actual river. I am sure there are pumps that can pump water up 100ft.

I appreciate the ideas.  Thank you all!
I'm going to look into everything and also heavy duty pipes or hoses.
There are deer trail down there, tons of coyotes all around, and I have shared tense moments in the driveway with a bear.
We can climb down to the river, but getting back up is truly difficult.  Hopefully find a durable setup.