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Show Record Saleratus Wash, but the material making up that bar has probably 308 changed hundreds of times; but it has not been washed away. Whether the same materialis now in the bar as was there twenty years ago, we found the bar in the same location, and its relation 309 to the channel would be practically the same. Through all twenty years since the Army report, and notwithstanding all of the floods, accumulation of silt and other conditions you have described, the Butterfly Bar has been out in the middle and dividing the river at substantially the same point and somewhat of the same general size. There are willows on that bar at an elevation of fifteen feet above the river. The tree showing in my picture of this bar ( Photograph 106) is probably a cottonwood. I said that on approximately half of the bars there are not even willows. 312- 313 Even though you find a bar in the same place each year, the cannel is not likely to be approximately in the same place, dependent on the different types of bars. With a crossing bar in all probability the channel would be at the same place. A stable bar 314 and a stable channel do not necessarily go together. Stability is a comparative term and such a condition would be very permanent as compared, for instance, with the channel of the Platte River or the Mississippi. I would not want to say that in general the 316 river bed is permanent. I saw evidence of an old river bed a quarter of a mile away from the present channel of the Green River. 317 This was at a point above the town of Green River. Except where 318 I have shown sounding at the crossing bars, the other soundings indicated on the exhibit are simply those taken along the downstream line followed by our boat, and I am unable to say definitely what the depth might be, 10 or 15 or 100 feet to the right or 319 left of that line; those soundings recorded in my report merely represent the depths I happened to get as our boat traveled down-stream. We did not go more than two and a half miles below the con-fluence because we thought submerged rocks were a possible danger. - 40 - |