队列项目 - beat365亚洲投注-beat365亚洲体育

In-stream projects are part of our larger Snake River Stewardship Program (SRSP) designed to improve water quality in the Snake River. 具体地说, these projects narrow and deepen sections of the Snake River channel far upstream of the Hells Canyon Complex (HCC) by expanding seasonal floodplains adjacent to river islands. This increases water velocity and reduces heating by decreasing the surface area of the river during low summer flows.

We plant these expanded floodplains with native trees and shrubs such as willows, rabbitbrush, 醋栗, native grasses and sedges to prevent erosion, provide shade and improve wetland habitat.

Our second project was completed in the fall of 2021, and we anticipate many more over the coming decades.

An illustration of how this type of island project narrows the river channel is shown below.

Images showing a before/after layout of the river around the islands, in which after the river is narrower and the floodplain expanded.

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Bayha岛

Bayha and Wright Islands are part of the U.S. Fish and Wildlife 服务 (USFWS) Snake River Islands Unit of the Deer Flat National Wildlife Refuge and are approximately 2.5 miles downstream of Walter’s Ferry in southwestern Idaho.

For this in-stream project, approximately 10 acres of floodplain were added adjacent to the islands. These videos show how the project began and what it looked like two years after completion:

之前:

后:

建设 consisted of dredging the river’s channel between Bayha and Wright islands and the south bank of the river, and narrowing the channel by creating additional wetlands around the islands. 建设 was completed in 2016. beat365亚洲投注 and The Freshwater Trust continued to work on the island, additional plants and installing temporary seasonal irrigation to help the new plants become established.

在下面的插图中, the orange and red indicate areas that were filled, while the blue is the river channel that was deepened. 估计有80人,000 cubic yards of fill material was dredged from the river bed or hauled from a gravel deposit on a neighboring landowner’s property. 这保持了大约4,000 dump truck trips off public roads and benefited the landowner by improving a field and pond.

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Rippee岛

beat365亚洲投注 completed construction on the Rippee岛 Research Project in fall 2021. The project created approximately 16.5 acres of floodplain, and the adjacent river channel was deepened to improve water flow and quality. This project builds on lessons learned from the Bayha岛 Research Project. Rippee岛 is located between the Walter’s Ferry and Bernard’s Ferry boat ramps (map).