Re: Why would two barometers(bottles w/neck upside down in a glass)be different

Barometric pressure would not be affected by your creek
since it measures only the weight of the overlying layers of
air.

One of the barometers might not be functioning.

A Test to try:
Place all three of them together for a day.
The two that always match probably work fine.
The next day you might move them all to a different spot
also.