The hydraulics component of the Klamath River Basin Revised Natural Flow Study focused on locations within the Klamath River Basin that are important to water storage and surficial exchange with other portions of the basin that may impact Klamath River streamflow. Key hydraulics components include area-capacity curves, lateral hydraulic connectivity, and engineered and natural hydraulic controls. These data detail the hydraulic modeling and topographic analyses that were used to inform the RiverWare mass balance modeling and natural streamflow estimates. Primarily those analyses include development of area-capacity (ACAP) relationships and hydraulic models that inform how water flows across certain locations of the landscape using rating curves and flow exchange relationships. Lakes and reservoirs where ACAP relationships were developed in Upper Klamath River Basin include Upper Klamath Lake, Lower Klamath Lake, and Tule Lake as well as inclusion of existing ACAP relationships at Rogue River basin reservoirs, PacifiCorp reservoirs, Gerber Reservoir, and Clear Lake. Reclamation developed hydraulic models at two main locations in the Upper Klamath River Basin: (1) from the downstream end of Upper Klamath Lake through the Link River; and (2) along the Klamath River reach between the Link River and Keno Dam. Predictions were developed using the Sedimentation and River Hydraulics – Two-Dimensional model. The Upper Klamath Lake products are rating curves that relate water surface elevation to a paired discharge flowing out of the lake for both 1981 to 2020 and pre-development conditions. The Link River to Keno pre-development modeling included results of flow exchange between the Klamath River and Lower Klamath Lake, as well as flow losses from the Klamath River to the Lost River Slough. This zip file contains hydraulic modeling data. To see the report associated with this dataset, please visit https://data.usbr.gov/catalog/8528/item/133876.