Bruce,

I would dam the stream up a little and dig a sump adjacent to the stream that doesn't allow debris to get in it, just water and have a submersible pump that can be used with a hose or go into the tank. Submersibles are good for pushing water up and wont be affected by air leaks like suction pump do. Check the pumps "pump curve" to see what the best flow rate at a certain head is for the pump. You would need a pump that operates at 20 ft plus the operating pressure head would want. If you want 20 psi at the hose end you need 20 ft of hgt diff plus 40 feet op head Plus 6 of contingency (not exactly friction loss) to equal 70 ft head. You would look for a pump that pushes 70 ft of head at what ever flow rate you are looking for. GL Aloha

I have the same setup

I purchased a shallow well jet pump e/w a small storage tank. Connected check valve and put pickup on end of 1" pipe and dropped it in the creek! Works well into the summer months when the creek goes dry. Then late fall, i'm able to pump again. Total cost was around $200 for pump and pipe. Check out Harbor Freight, as their $120 pump works fine for this application!!!