If the creek has the fall, I would use a hydraulic ram pump. It would run with no cost. Maintenance would be minimal and you can build it from part you can get from the local big box store.

Here is a link to one example:

http://www.clemson.edu/irrig/equip/ram.htm

Brian

The one thing is the one thing
A dry fly catches no fish
Try not to be THAT 10%