5-30 CFS Dual Screen
Looking downstream to the site from across Coe Creek.
Coe Creek flows from the Coe Glacier on Mt. Hood and is a prime Bull Trout stream. Glacially fed streams flowing down the flanks of Mt. Hood tend to carry a large quantity of fine sediment as well as being prone to large debris flows in the spring and fall. Coe Creek is no exception.
This custom designed Farmers Screen is a dual design to accommodate a wide flow range. The district draws between 5 and 30 CFS from Coe Creek, depending on the time of year and water quality. The district operates one screen when flows are 15 CFS or less and then can operate both screens when flows exceed 15 CFS. Both screens are equipped with a sediment management system consisting of a slotted pipe system laying on the floor of the structure (in the screen underbay) just inside of the weir wall. The slotted pipe is used as a continuous flush mechanism which sucks any sediment which could settle out under the screen and sends it back to the creek. Water can be diverted with turbidity levels of over 1000 NTU’s.
In 2006, Middle Fork Irrigation District began the process of designing and permitting the removal of their dam on Coe Creek and the construction of a new fish screen. This diversion is located on the Mt. Hood National Forest and supplies irrigation water for agriculture and produces hydro power. The project included removing the dam (which was a passage barrier), installing rock weirs for grade control, restoring the stream channel, and installing a custom Farmers Screen with a sediment control system.
Construction began in the early fall of 2009 and was completed by the end of December of 2009. The restored stream allows for up and downstream passage in the stream channel. The new fish screen allows the district to manage sediment much more effectively while reducing their maintenance requirements.