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Surface Water Data and Monitoring tools for Pennsylvania
Current Streamflow: Static Map | | Interactive Map
Average streamflow: 7-day | 14-day | 28-day
Pennsylvania Drought Condition Monitoring
Real-Time Data: Streamflow | Lake/Reservoir | Water Temperature | Precipitation
Daily Data: Streamflow
Site Inventory: Site Selection Criteria
Statistics: Daily | Monthly | Annual
Peak Streamflow Data
Ratings are available to agencies and other interested parties from the depot via the following URL:https://waterdata.usgs.gov/nwisweb/data/ratings/exsa/USGS.XXXXXXXX.exsa.rdb where XXXXXXXX is the 8-15 digit USGS station number. [example: https://waterdata.usgs.gov/nwisweb/data/ratings/exsa/USGS.03599500.exsa.rdb]
Currently the depot is limited to stage-discharge ratings. For a slope station, only the base stage-discharge rating will be available and for an index-velocity station no rating will be available.
It is important to note that ratings will change, and sometimes frequently. Checking the depot regularly will ensure that the currently applicable shifted rating is used for the current data, and that the current rating cannot necessarily be used on historical data. A standard disclaimer statement at the head of each rating file is included indicating this.
"Stage-discharge relations (ratings) are usually developed from a graphical analysis of numerous discharge measurements. Measurements are made on various schedules and sometimes for different purposes. All discharge measurements are compiled and maintained in a data base. Each measurement is carefully made, and undergoes quality assurance review. Some measurements indicate a temporary change in the rating, often due to a change in the streambed (for example, erosion or deposition) or growth of riparian vegetation. Such changes are called shifts; they may indicate a short- or long-term change in the rating for the gage. In normal usage, the measured shifts (or corrections) are applied mathematically to a defined rating.
The tables being provided are shift corrected, incorporating the mathematical adjustments for ease of use by the user. The shift adjustments are applied to the individual ratings as measured data becomes available, resulting in an adjusted rating. Some ratings may change as often as weekly, others may not change for months or years.
Related projects and activities
Datasets and Tools (Apps)
The PA Drought Condition Monitoring Application shows the current drought status for each county and hydrologic conditions for precipitation, streamflow, groundwater levels, and Palmer Drought-Severity Index used by PA DEP for drought monitoring.
Below are publications associated with this project.
StreamStats is a national web-based application that provides selected water-resource information for Pennsylvania. Users can easily obtain descriptive information, basin characteristics, and streamflow statistics for USGS streamgages and ungaged stream locations throughout the Commonwealth. Water use data is also available for Pennsylvania in StreamStats.
Below are software products associated with this project.
The Delaware River Basin Streamflow Estimator Tool (DRB-SET) estimates baseline and altered streamflow at a daily time step for ungaged stream locations in the Delaware River Basin for water years 1960-2010.
Estimation of Baseline Daily Mean Streamflows for Ungaged Locations on Pennsylvania Streams, Water Years 1960–2008
USGS groundwater and surface water monitoring data contributed to the August 21, 2020 drought watch declaration for 16 counties by the Pennsylvania...
The scarcity or overabundance of water presents some of the most dangerous, damaging and costly threats to human life, ecosystems and property in the...
Hurricane Isaias swept over eastern Pennsylvania August 4th and 5th, dumping upwards of 8 inches of rain and resulting in wide-spread flooding. New...