Section 303(d) of the Federal Clean Water Act requires states to identify waterbodies that do not meet water quality standards and to develop total maximum daily pollutant loads (TMDLs) for those waterbodies. A TMDL is the amount of a pollutant that a waterbody can assimilate without exceeding the established water quality standard for that pollutant. Through a TMDL, pollutant loads can be allocated to point sources and nonpoint sources discharging to a waterbody. This report presents TMDLs for nutrients for Bear Creek Lake (an upland reservoir), Mallard Lake (a lowland reservoir), First Old River Lake, Grand Lake, Horseshoe Lake, and Old Town Lake (oxbows). All lakes are located in the Mississippi Alluvial Plain ecoregion, with the exception of First Old River Lake, which is located in the South Central Plains ecoregion. All six lakes were identified by the United States (US) Environmental Protection Agency (EPA) to be in violation of Arkansas narrative water-quality criteria for nutrients. EPA added these six lakes to the final 2002 303(d) list for Arkansas and they were carried forward to the draft 2004 303(d) list and the final 2004 303(d) list. This report presents an approach to developing target concentrations for nutrient TMDLs for oxbow lakes and small impoundments. This approach is based on the assumption that target levels must be protective of designated uses. The primary use of concern in these lakes is aquatic life (i.e., sport fisheries). This approach employs a quantitative measure of the potential quality of the sport fishery as an indicator of aquatic life support. Since little quantitative data regarding fisheries is available for Arkansas lakes, this approach relied heavily on data collected by the Bureau of Fisheries of the Mississippi Department of Wildlife, Fisheries, and Parks from selected oxbow lakes in that state. Most of these Mississippi lakes are located in close geographic proximity to the Arkansas study lakes and occur in similar habitats and on similar soil types. Information from Mississippi lakes was augmented by information gathered from Arkansas Game and Fish Commission (AGFC) district fisheries biologists concerning the quality of fishing in the lakes considered in this report.