Total streamflow across the Yakima River was last observed at 7,790 cfs, and is expected to yield approximately 15,451 acre-ft of water today; about 84% of normal. Average streamflow for this time of year is 9,312 cfs, with recent peaks last observed on 2011-05-18 when daily discharge volume was observed at 78,140 cfs.

Maximum discharge along the river is currently at the Yakima River At Kiona reporting a streamflow rate of 2,490 cfs. However, the streamgauge with the highest stage along the river is the Yakima River Above Ahtanum Creek At Union Gap with a gauge stage of 40.7 ft. This river is monitored from 4 different streamgauging stations along the Yakima River, the highest being situated at an altitude of 1,338 ft, the Yakima River At Umtanum.

The Yakima River is a tributary of the Columbia River that flows through Washington State. It stretches for 214 miles and has a rich history, having been home to various Native American tribes for centuries. It is also a popular destination for fly-fishing enthusiasts, as it is home to a variety of fish species, including trout, salmon, and steelhead.

The river's hydrology has been impacted by human activity, including the construction of dams and reservoirs. The Yakima River Basin Storage Alliance has worked to create reservoirs and dams that provide irrigation water to farms and ranches in the region, while also helping to protect the river's ecosystem.

Some of the most notable reservoirs on the Yakima River include the Cle Elum Lake Reservoir and the Bumping Lake Reservoir. The Yakima River also supports a variety of recreational activities, including camping, hiking, and rafting.