Stream discharge in gaged watersheds at the Andrews Experimental Forest, 1949 to present

  • PI: Sherri L. Johnson
  • Originator: Jack S. Rothacher
  • Other researchers: Julia A. Jones, Jeffrey J. McDonnell
  • Dates of data collection: Oct 1 1949 - Oct 1 2016
  • Data collection status: Study continues and further data collection is planned
  • Data access: Online
  • Last update: Dec 28 2016 (Version 28)
<Citation>     <Acknowledgement>     <Disclaimer>    
Johnson, S.; Rothacher, J. 2016. Stream discharge in gaged watersheds at the Andrews Experimental Forest, 1949 to present. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: (18 June 2018) DOI:
Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 1440409), US Forest Service Pacific Northwest Research Station, and Oregon State University.
While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is". The Andrews LTER shall not be liable for damages resulting from any use or misinterpretation of data sets.

Streamflow from selected small watersheds has been continuously monitored at the Andrews Forest beginning in November 1952 and the Lookout Creek Gauging Station has been maintained by the USGS since October, 1949. The objectives of this study include: (1) to evaluate long-term changes in hydrology associated with various management treatments, notably clearcut logging, selective logging, and burning; (2) to provide baseline data for affiliated precipitation and stream water chemistry and sediment transport studies; and (3) to characterize the hydrologic regime of old-growth forests at different elevations. Streamflow records from small watersheds began in November 1952 at WS 1,2, and 3 (60 to 100 ha), 1963 at WS 6, 7, and 8 (15 to 22 ha) 1968 at WS 9 and 10 (9 and 10 ha), 1980 at Mack Creek (580 ha), and 1949 at Lookout Creek (2440 ha). Data has been collected continuously since the start of data collection for all watersheds with the exception of WS7, which was shut down as a cost-saving maneuver from WY1988 through WY1994 (7 years).

Raw instantaneous streamflow data in cubic feet per second (cfs) and mean flow at fine temporal intervals are available. Rating curves for fixed trapezoidal flumes are maintained for all small watersheds except Lookout Creek and allow calculation of mean and total flow. The USGS-maintained Lookout Creek relies on annual rating table development to reflect changes in the open channel for instantaneous flow calculation. Entity 1 includes a reconstructed history of USGS Lookout Creek hourly data beginning in 1950 and more recently 30 and 15 minute interval data. Calculated mean cfs and total flow for each watershed are available at daily (Entity 2), monthly (Entity 3), annual (Entity 4), and stream sampling (Entity 6) time intervals. An interactive program, FLOW (Entity 5), allows the user to download instantaneous, mean and total flow at requested time periods (e.g., 15 minute, hourly) for all watersheds except for Lookout Creek.

Study Description Study Site Map Download Study Location Information: (CSV)
Download Full Documentation: (PDF)(EML)
1Corrected instantaneous stage height with flow calculations (Oct 1 1949 - Apr 9 2018)METADATADATA
Only Lookout Creek streamflow data is available here. Please use Entity 5 (the interactive FLOW program) to download high temporal resolution streamflow data for all other Andrews small watersheds. Lookout Creek data available here: 1) Hourly data has been reconstructed from USGS and USFS streamflow charts and punch tapes (1950-1986), 2) USGS 30 minute data (1986-2010), and 3) USGS 15 minute data (2010-present).
2Daily streamflow summaries (Oct 1 1949 - Oct 1 2016)METADATADATA
Daily data can also be interactively viewed, downloaded, and graphically displayed using ClimDB/HydroDB.
3Monthly streamflow summaries (Oct 1 1949 - Oct 1 2016)METADATADATA
Monthly data can also be interactively viewed, downloaded, and graphically displayed using ClimDB/HydroDB.
4Annual streamflow summaries by wateryear (October 1 - September 30) (Oct 1 1949 - Oct 1 2016)METADATADATA
Annual data can also be interactively viewed, downloaded, and graphically displayed using ClimDB/HydroDB.
5Instantaneous and total discharge for requested time intervals (Oct 1 1953 - Oct 1 2016)METADATADATA
This is the interactive FLOW program which allows downloads of all Andrews small watersheds for any time period at user-specified time intervals. Rating equations can also be displayed.
6Flow summaries for sediment and nutrient sampling periods (Oct 1 1968 - Oct 1 2016)METADATADATA
Total flow is summarized, generally in 3 week periods, for inclusion with stream sampling data in CF002.

 Calculation of streamflow inches per day (or time interval) over the watershed area - The general equation to calculate streamflow in inches per day (or per any time interval) is presented, as well as the areas of HJ Andrews watersheds required in this equation.
 Watershed Descriptions - Describes watershed characteristics including location, geology, soils, hydrology, vegetation, climate, and history.
 Rating curve summary - A summary of streamflow calculation and rating curves for small gauged watersheds in the Andrews Experimental Forest
 Rating curve equations - Rating curve equation sets and versions with constant values and maximum stage height provided for each equation
 Flow calculation using rating curves - A description of the calculus algorithm
 Andrews flume descriptions - A history and description of small watershed flumes at the Andrews
 Streamflow measurement - A history and description of streamflow measurement methods and instrumentation
 Rating curve graphs - Graphs from sample calibration points
 HJA Data Portal - Provisional real-time data from climate and hydrology stations on the Andrews Experimental Forest
 Provisional Andrews Experimental Forest Climate and Hydrology Data - Access provisional real-time data from sites across the Andrews Forest provided in a browsable list powered by GCE Toolbox

 Stream chemistry concentrations and fluxes using proportional sampling in the Andrews Experimental Forest, 1968 to present (CF002)
 Meteorological data from benchmark stations at the Andrews Experimental Forest, 1957 to present (MS001)

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