A tile map of the U.S. showing mean daily stream temperature for the 5 USGS stream sites with the longest daily temperature records in each U.S. state. The oldest site, in Philadelphia, Pennsylvania, began collecting data in October 1964.
Natalie Schmer
Natalie Schmer is a Hydrologist with the Pennsylvania Water Science Center.
Her current work focuses on surface water quality, using both discrete and continuous water-quality measurements along with surrogate regression modeling to estimate concentrations and loads for several different water quality constituents including suspended sediment, total nitrogen, and total phosphorus. She is also interested in a variety of other topics such as aquatic ecosystem ecology (specifically river metabolism), data visualization, and science communication.
Current Projects
- Surrogate regression modeling for sediment and nutrient concentration and loads in sub-basins of the Chesapeake Bay Watershed
- Analyzing nutrient and sediment dynamics in the lower Susquehanna watershed
- Surface and ground water sampling
Professional Experience
2021-Present – Hydrologist, Pennsylvania Water Science Center
Education and Certifications
M.S., Ecology, Colorado State University, 2021
B.S., Environmental Sciences and Geology, University of Wisconsin-Madison, 2019
Science and Products
Legacy sediment as a potential source of orthophosphate: Preliminary conceptual and geochemical models for the Susquehanna River, Chesapeake Bay watershed, USA
Nutrient pollution from agriculture and urban areas plus acid mine drainage (AMD) from legacy coal mines are primary causes of water-quality impairment in the Susquehanna River, which is the predominant source of freshwater and nutrients entering the Chesapeake Bay. Recent increases in the delivery of dissolved orthophosphate (PO4) from the river to the bay may be linked to long-term increases in
Susquehanna River and Basin
Pennsylvania Super Gages
York County Sediment and Nutrient Monitoring
Calibration data and model archive summaries for suspended-sediment, total nitrogen, and total phosphorus concentration surrogate models in York County, Pennsylvania, 2019-2023
Surrogate regression models for computation of time series suspended-sediment, Delaware River Basin NGWOS, 2019 through 2022
A tile map of the U.S. showing mean daily stream temperature for the 5 USGS stream sites with the longest daily temperature records in each U.S. state. The oldest site, in Philadelphia, Pennsylvania, began collecting data in October 1964.
Science and Products
- Publications
Legacy sediment as a potential source of orthophosphate: Preliminary conceptual and geochemical models for the Susquehanna River, Chesapeake Bay watershed, USA
Nutrient pollution from agriculture and urban areas plus acid mine drainage (AMD) from legacy coal mines are primary causes of water-quality impairment in the Susquehanna River, which is the predominant source of freshwater and nutrients entering the Chesapeake Bay. Recent increases in the delivery of dissolved orthophosphate (PO4) from the river to the bay may be linked to long-term increases in
AuthorsCharles A. Cravotta, Travis L. Tasker, Peter M. Smyntek, Joel Blomquist, John Clune, Qian Zhang, Noah Schmadel, Natalie Katrina Schmer - Science
Susquehanna River and Basin
In Pennsylvania, the USGS's water-resources roots date back to the late 1800's, with the initiation of streamflow gaging on the Susquehanna and Delaware Rivers and assessments of groundwater resources near Philadelphia. The USGS Pennsylvania Water Science Center continues to provide scientific information about the water resources of the Susquehanna River Basin, in cooperation with regional and...Pennsylvania Super Gages
What is a Super Gage? A gage at which continuous flow and water level are determined, along with continuous traditional water-quality (water temperature, specific conductance, pH, dissolved oxygen, and/or turbidity) and either of the following criteria: at least one other less-traditional continuous water-quality parameter (orthophosphate, nitrate concentration) and/or where surrogates (developed...York County Sediment and Nutrient Monitoring
Since 2019, the USGS Pennsylvania Water Science Center has been cooperating with York County, Pennsylvania to implement in-stream monitoring to produce surrogate regression equations to compute, in real time, the concentration and load of total nitrogen, total phosphorus, and suspended sediment for 6 major watersheds in York County, Pennsylvania. This partnership provides the York County Planning... - Data
Calibration data and model archive summaries for suspended-sediment, total nitrogen, and total phosphorus concentration surrogate models in York County, Pennsylvania, 2019-2023
Total Nitrogen models are still in development and are not yet available. Anticipated availability is early April 2024. Information on this page will be edited as needed. The U.S. Geological Survey (USGS), in cooperation with the York County Planning Commission and York County Conservation District, has collected discrete stream samples for analysis of suspended-sediment, total nitrogen, and totSurrogate regression models for computation of time series suspended-sediment, Delaware River Basin NGWOS, 2019 through 2022
The U.S. Geological Survey (USGS), as part of the Next Generation Water Observing System (NGWOS) has collected discrete stream samples for analysis of suspended-sediment concentrations at eight real-time streamflow and water-quality monitoring (turbidity and suspended sediment) stations located in Pennsylvania, New Jersey, and New York in the Delaware River Basin. Data were collected from 2019-202 - Multimedia
Timeseries: down/upwards - Long-term daily stream temperaturesTimeseries: down/upwards - Long-term daily stream temperatures
A tile map of the U.S. showing mean daily stream temperature for the 5 USGS stream sites with the longest daily temperature records in each U.S. state. The oldest site, in Philadelphia, Pennsylvania, began collecting data in October 1964.
A tile map of the U.S. showing mean daily stream temperature for the 5 USGS stream sites with the longest daily temperature records in each U.S. state. The oldest site, in Philadelphia, Pennsylvania, began collecting data in October 1964.