Average daily minimum dissolved oxygen (DO) concentration in upstream (US), impoundment (IMP), and downstream (DS) reaches before and after dam removal.

Overall minimum (i.e., lowest concentration recorded) in parentheses. Blue shading represents average minimum DO concentrations >6 mg/L, green shading represents <6 and >5 mg/L, and orange shading represents <5 mg/L, a threshold below which waters are considered impaired for DO (MDEP 2016). Grey shading and dash symbols (-) indicate no dam removal occurred over the course of this study.