LOWER PLATTE RIVER BASIN

Week6 -Summary Ice Report

February 21, 1997
Due to the unseasonably mild weather over eastern Nebraska the Lower Platte River system has started to open up. Consequently there are many trouble spots due to ice action and rising flows due to snowmelt.

Generally the Upper Loup River Basin is open with some floating ice. On February 20, the Loup River north of Palmer was 50% open with 30% floating ice. An ice bridge caused some lowland flooding. In the Fullerton area the Loup was reported to be 80% choked with slowly moving ice. A localized ice jam caused lowland flooding. On the morning of February 20 the Loup at Genoa was reported to be passing 5,000 cfs in the river with 2,100 cfs in the Loup Power Canal. That afternoon the river was 15,000 cfs and was heavily packed with floating ice. Below Columbus on February 21 an ice jam four miles west of the Hwy. 15 bridge has caused lowland flooding on both banks.

On the afternoon of February 20 the Lower Platte River at the Hwy. 79 bridge, the North Bend area had a good open channel with slowly moving ice. Flow was estimated to be 25-30,000 cfs. Ice remaining in place was very rotten and severely fractured. On the south bank water was on top of the ice and around the edges of sandbars. Downstream in the Fremont area there was a good open channel in the Big Island area. Ice was badly decayed near the Hwy. 77 bridge. At this point the river was bankfull and still ice covered. On the morning of February 21 conditions were about the same with some minor rises noted. Ice was badly decayed. On February 20 at the Hwy. 92 bridge, the Lower Platte River had two good open channels. Raises in river levels were noted on February 21.

Along the Elkhorn River on February 21 the ice jam above West Point had broken up and had moved downstream to join the previously reported jam two to three miles below West Point. In the Winslow area on February 19, a small channel had opened up. Water was pooled and was flowing over the intact ice. East of Winslow the Elkhorn was open with no floating ice. Lowland flooding was reported on Logan Creek two miles north of Winslow. Downstream near Crowell, Hwy. 275 was closed. Near the Hwy. 30 bridge in the Arlington area on February 20, the effects of sharp fluctuations due to ice action were evident. In the Waterloo area the Elkhorn was open with good flow, estimated to be 10-15,000 cfs. There was 50% floating ice reported. These conditions continued downstream to the confluence with the Lower Platte River.

Below the confluence on February 20 a large ice jam formed in the Hwy. 6 bridge area. Ice piled up on the Burlington Northern Railroad bridge caused much lowland flooding in the Beacon View area (East bank) and in the Nebraska National Guard Camp (West bank). Dynamite blasting and crane-shovel wrecking ball operations were initiated on February 20. On the morning of February 21 a channel had been opened below the Hwy. 6 bridge and efforts were being made to continue upstream. Densely packed slab ice choked the Lower Platte River for miles. Downstream near South Bend a contractor had opened about five spans of the Old Rock Island bridge and was continuing to clear the debris. Good channels were reported near the Hwy. 50 bridge and in the Cedar Creek area. Ice bridges were reported to be forming on sandbars. Downstream of the Hwy. 75 bridge the open channel has increased considerably in size and extends to the confluence with the Missouri River.

On the Missouri River there was 30,000 cfs being released from Gavins Point. There was much floating ice in the river.