Taken from the Texas Water Development Board's December, 2006, Reservoir Site Protection Study, here are four maps of interest:

• Figure 3.4.8-1. Location Map for Marvin Nichols Reservoir (Site IA)
  
  
• Figure 3.4.8-3. Inundation Map for Marvin Nichols Reservoir
  
  
• Figure 3.4.8-6. Potential Major Conflicts for Marvin Nichols Reservoir
  
  
• Figure 3.4.8-7. Existing Landcover for Marvin Nichols Reservoir