6 
Figure 11-3. The number of times the bottom water temperatures were greater than 29°C 
from June-September 1996-2002 at the Chesapeake Bay Water Quality Monitoring 
Program stations located in the District of Columbia's tidal waters. 
Source: Chesapeake Bay Water Quality Monitoring Program database. 
http://www.chesapeakebay.net/data 
Based on these evaluations, there appear to be no widespread tidal water habitats 
exceeding the 29°C threshold, thereby requiring routine application of the 
temperature-based 4.3 mg liter 1 instantaneous minimum dissolved oxygen criteria. 
Jurisdictions are advised to evaluate water column temperatures prior to assessing 
attainment of the open-water dissolved oxygen criteria to determine if, w'here and 
when this temperature-based dissolved oxygen criterion should be applied to protect 
the open-water designated use. 
LITERATURE CITED 
U. S. Environmental Protection Agency. 2003. Ambient Water Quality Criteria for Dissolved 
Oxygen . Water Clarity' and Chlorophyll a for the Chesapeake Bay and Its Tidal Tributaries. 
EPA 903-R-03-002. Region III Chesapeake Bay Program Office, Annapolis, Maryland. 
chapter ii • Shortnose Sturgeon Temperature Sensitivity Analyses 
