Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

* We've detected you're using a mobile device. Find our Next Generation Station Page here.
Click to hideNews Bulletins
  • The issue impacting the delivery of satellite data transmissions in the western United States has been resolved. Current data for impacted locations are now accessible from USGS web portals. The data to fill any resultant gaps in water records will be downloaded from field equipment for manual upload following the next scheduled field visit.
  • Explore the NEW USGS National Water Dashboard interactive map to access real-time water data from over 13,500 stations nationwide.
  • Full News RSS icon
Click to hide state-specific text

* IMPORTANT: Next Generation Station Page



Click to hidestation-specific text

LOCATION.--Lat 39°11'31.9", long 77°00'15.8", Montgomery County, MD, Hydrologic Unit 02060006,
   on right bank at Brighton Dam, 500 ft downstream from Triadelphia Reservoir, 1.3 mi east of Brighton,
   and 92 mi upstream from mouth.
DRAINAGE AREA.--78.6 mi2.
PERIOD OF RECORD.--October 1980 to current year.
REVISIONS HISTORY.--https://waterdata.usgs.gov/nwis/dv/?site_no=01591610: 2013.
GAGE.--Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 302.98 ft above North 
   American Vertical Datum of 1988. June 1978 to October 1980, nonrecording gage 300 ft upstream on
   left bank at different gage datum.
REMARKS.--Flow completely regulated by Triadelphia Reservoir, 500 ft upstream, usable capacity,
   6,200,000,000 gal; no dead storage. U.S. Geological Survey satellite data-collection platform at station.
   Water-quality records for some prior periods have been collected at this location.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 8,600 ft³/s, Jan. 31, 2013, gage height, 11.88 ft;
   minimum discharge, 0.88 ft³/s, Feb. 29, 2012.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of June 22, 1972 reached a discharge of 17,800 ft3/s.
   Data provided by Washington Suburban Sanitary Commission.
COOPERATION.--Funding for the operation of this station is provided by the Washington Suburban Sanitary
   Commission, and the U.S. Geological Survey.
Boating safety tips
This station managed by the MD-DE-DC Water Science Center Baltimore office.

Available Parameters Available Period
2013-04-05  2017-10-10
1988-05-17  2021-07-26
2007-10-01  2021-07-26


  -- or --



Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 85.5 07-26-2021   09:45 EDT
Graph of  Discharge, cubic feet per second

Add up to 2 more sites and replot for "Discharge, cubic feet per second"


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages

Daily discharge, cubic feet per second -- statistics for Jul 26 based on 40 water years of record more
Median Mean 75th
Most Recent
Value Jul 26
9.10 43 55 62 74 85.5 247

Gage height, feet

Most recent instantaneous value: 1.92 07-26-2021   09:45 EDT
Graph of  Gage height, feet

Add up to 2 more sites and replot for "Gage height, feet"


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages