Cyanobacterial harmful algal blooms (CyanoHABs) are a global concern due to their increasing distribution, frequency, and prevalence of toxins, such as microcystin. CyanoHABs impact a wide range of marine and freshwater systems including smaller reservoirs, like Lake Fayetteville, a 78.5 ha hypereutrophic reservoir located in Northwest Arkansas. Previous work focused on the ratio of photopigments phycocyanin and chlorophyll (PC:CHL), found cyanobacteria dominated the phytoplankton community in Lake Fayetteville during the growing season (i.e. May through October. However, microcystin concentrations were typically only elevated in late spring and early fall each year, suggesting that more specific data about the cyanobacterial community is needed to better understand the drivers of microcystin production in the lake. From 2022 through 2024, water samples were collected from Lake Fayetteville at a 1-to-2-week interval and analyzed for physical parameters, dissolved and total nutrients, microcystin, chlorophyll, and PC:CHL. Additionally, a 20 ml aliquot was preserved for algal identification. Cyanobacteria continued to be the dominant phytoplankton group during the growing season in 2022, 2023, and 2024, with diatoms being the dominant group during the winter. Examining the cyanobacteria genera, we found Dolichospermum and Microcystis (microcystin producing taxa) were the dominant genera in the spring and late fall, with Raphidiopsis (non-microcystin producing genera) more common during the summer. It is during the periods when Microcystis and Dolichospermum are present in the phytoplankton community that the toxin microcystin is most prevalent in the water and surface scums. Future analysis will look at how physical and chemical parameters relate to the phytoplankton community in the lake throughout the year, with the goal of developing a framework that lake managers can use to determine when to have samples collected and for issuing advisories.