Frogs and flows were the topic of conversation on Tuesday night for a packed house at McMenamins. The Coalition for the Deschutes hosted a community education program presented by Jason Gritzner of the US Forest Service and Jennifer O’Reilly of the US Department of Fish and Wildlife Services.
Jason Gritzner presented flow and riparian studies from the Upper Deschutes River that span the past 60 years starting from the completion of Crane Prairie and Wickiup Reservoirs. Prior to the construction of Wickiup Dam, flows in the spring-fed Deschutes River varied little between seasons and years. Historically, flows in the summer averaged 730 cubic feet per second (cfs) and dropped to an average of 660 cfs in the winter. Today flows fluctuate dramatically between an average of 1800 cfs in the summer and a minimum of 20 cfs in the winter storage season. This new flow pattern creates significant challenges for a river that was not built for fluctuations, including significant erosion that has resulted in a widening of the channel by about 20% and a straightening of the channel. This winter, as a part of the Oregon Spotted Frog Settlement, irrigators have agreed to increase minimum winter flows to 100 cfs.
Jennifer O’Reilly informed last night’s seminar attendees about the lifecycle, breeding needs and habitat requirements of the Oregon spotted frog. The frog was listed as a Threatened Species in 2014 under the Endangered Species Act. Environmental groups have filed litigation to restore flows in the Upper Deschutes to protect frog habitat. The fluctuations in streamflow resulting from irrigation fulfillment in the summer and storage in the winter have created a difficult environment for the frogs to thrive.
To conclude the evening, Jason Gritzner highlighted the connection between the plight of the Oregon spotted frog and the overall health of the river. Because amphibians are considered an environmental indicator species, a distressed population confirms distress in the overall ecosystem in the Upper Deschutes.
Want to learn more? There are more community learning opportunities to come!