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1 <br /> <br /> Table 2. Field Surve Observations 18-19 December 1996 <br />Y <br /> Date Time Comments <br /> 18 Dec. 96 1515 RM 302. Jensen Bridge. Frazil pans in the form of very regular pancake <br /> ice in motion. Some border ice. <br />' 1545 RM 317. Green River Campground. Frazil pans in motion. <br /> 1600 RM 316. Immediately downstream of Chew Bridge. Border ice growth <br /> in bend. Restricting progress of frazil pans somewhat. <br />' 1645 RM 290. Bonanza Bridge. Frazil pans in motion. Some border ice and <br /> large ice islands. <br /> 19 Dec. 96 0840 RM 248. Ouray Bridge. Frazil slush in motion. No frazil pans. Border <br />ice. <br /> 0920 RM 249.5. Downstream end of Old Charley Wash.- Toe of ice jam in <br /> very sharp bend. Ice cover not consolidated. <br />' 1000 RM 251.8. Ice jam in place. <br /> 1010 RM 253.5. Large open lead. Ice arch visible upstream at approximately <br /> RM 253.8. 100% ice coverage upstream of that point. <br /> 1015 RM 254.8. 100% ice coverage. Juxtaposed pans. <br /> 1025 RM 255.6. Boat ramp. Open water lead. 100% ice cover upstream and <br /> downstream. <br />' 1035 RM 257. Smooth, static ice in slow flowing areas of the river channel. <br /> Frazil pans form ice cover in main channel. <br />' 1045 RM 259. 100% ice coverage. <br /> 1120 RM 262. Open water reach. 100% ice coverage upstream. Some frazil <br /> slush, very little, emerging from downstream end of upstream ice cover. <br /> 1150 Overlook directly above RM 262. Stationary ice up to approximately <br /> RM 266. with some open leads. Ice cover formed by juxtaposition of <br /> frazil pans. <br />' 1340 RM 289.8. Bonanza Bridge. Large moving pans. <br /> 1355 Overlook at Horseshoe Bend. Ice moving at RM 276 and upstream of <br /> that point. <br /> 1415 RM 274-275. Large pans moving. <br /> 1520 View from RM 268.8-269. Observed the apparent head of jam at <br /> <br />' approximately RM 268. Moving pans upstream of that point. Water <br />visible moving up on dry sand bar at RM 268.8. Apparent increase in <br /> stage due to ice jam formation downstream. <br /> 1635 RM 302. Jensen Bridge. Frazil pans moving downstream. <br />1 <br /> <br /> <br />' 27 <br />