Went back to survey the Delta River at Black Rapids with my friend Mike from Glenallen. Hadn't been there for a winter visit in awhile (Flight Time 4/03/09). Unlike the last time, we had great weather and no equipment problems. The only odd thing we found was that the river was almost frozen to the bottom in the middle, while the two sides of the channel had most of the flow. This created high water pressure that forced water up and out of the center holes, forming a pool of water-covered ice in the middle of the channel. It added new meaning to the phrase slipping up on the job.