Total streamflow across the Meramec River was last observed at 4,585 cfs, and is expected to yield approximately 9,095 acre-ft of water today; about 91% of normal. Average streamflow for this time of year is 5,033 cfs, with recent peaks last observed on 2015-12-30 when daily discharge volume was observed at 227,910 cfs.

Maximum discharge along the river is currently at the Meramec River Near Eureka reporting a streamflow rate of 1,490 cfs. However, the streamgauge with the highest stage along the river is the Meramec River Near Sullivan with a gauge stage of 4.21 ft. This river is monitored from 5 different streamgauging stations along the Meramec River, the highest being situated at an altitude of 877 ft, the Meramec River At Cook Station.

The Meramec River is a 218-mile-long tributary of the Mississippi River that flows through eastern Missouri. The river has played a significant role in the history of the region, serving as a transportation route for Native Americans and early settlers. The river has also been the site of several notable floods, including the devastating floods of 1993 and 2015. The river's hydrology is influenced by numerous tributaries, including the Bourbeuse and Big Rivers. The Meramec River is home to several reservoirs and dams, including the Meramec State Park Dam and the Fenton City Park Dam. These structures serve a variety of purposes, including flood control and hydroelectric power generation. The river is popular for recreational activities, including fishing, canoeing, and camping, and also supports a thriving agricultural industry.