All Maryland-Delaware-District of
Columbia times are reported in Eastern Standard Time (EST). To
convert to Eastern Daylight Time (EDT) add 1
Daily Streamflow Conditions
Select a site to retrieve data and station information.
76th - 90th
25th - 75th
10th - 24th
The colored dots on this map depict streamflow conditions as a
percentile, which is computed from the period of record for the
current day of the year. Only stations with at least 30 years of
record are used.
The gray circles indicate other stations that were not ranked in
percentiles either because they have fewer than 30 years of record or
because they report parameters other than streamflow. Some stations,
for example, measure stage only.
IMPORTANT INFORMATION FOR: Partners, Stakeholders, and
Data Users of the USGS Maryland-Delaware-District of Columbia
Streamflow-, Tide-, and Reservoir-Elevation-Gage Networks
Referencing local streamflow, tide, and reservoir-elevation
gage-height data to the North American Vertical Datum of 1988
Real-time data typically are recorded at 15-60 minute intervals, stored
onsite, and then transmitted to USGS offices every 1 to 4 hours,
depending on the data relay technique used. Recording and transmission
times may be more frequent during critical events. Data from real-time
sites are relayed to USGS offices via satellite, telephone, and/or
radio and are available for viewing within minutes of arrival. All
real-time data are provisional and
subject to revision.