Stream Hydrology Program

Water resources

Stream Hydrology Program

Greg Kruse, Water Monitoring and Surveys Unit Supervisor


Flood warning and Stream flow monitoring This link leads to a video.


The Stream Hydrology Program exists to support the DNR Ecological and Water Resources director and staff by collecting data and providing information on stream flows in Minnesota that are needed to effectively carry out DNR  statutory responsibilities and water management programs.


The director of DNR Ecological and Water Resources has been delegated authority from the DNR commissioner for administering the majority of the state water law contained in Minnesota Statutes, Chapter 103G. Chapter 103G gives the commissioner authority to regulate work in public waters; control the appropriation and use of water; ensure the safety of dams; and conduct water resource surveys, investigations, and studies.

Specifically, Section 103G.285, Subdivision 2 makes the commissioner responsible for limiting water withdrawals from streams during low flow conditions:

If data are available, permits to appropriate water from natural and altered natural watercourses must be limited so that consumptive appropriations are not made from the watercourses during periods of specified low flows. The purpose of the limit is to safeguard water availability for instream uses and for downstream higher priority users located reasonably near the site of appropriation.

Clientele, Products, and Services

Primary clientele are DNR Ecological and Water Resources technical staff, supervisors, and managers who need stream flow information to make permit decisions. Secondary clientele include technical staff in other DNR divisions, other agencies, local governments, consulting engineering firms, and members of the public needing stream flow information for planning and management decisions.

Requests for stream gaging assistance come from DNR field hydrologists, other state agency staff, and local governments and watershed organizations. More requests are received than can be served, so project priorities must be determined.

Products provided by the Stream Hydrology Program include:

Services provided by the Stream Hydrology Program include:

Information Management

The Stream Hydrology Program uses a unique database and processing software known as HYDSTRA for storage and management of the data from the network of stream gages.

The HYDSTRA system stores DNR stream data, and the Minnesota Pollution Control Agency (MNPCA) stream data. This is the first time the DNR and MNPCA are archiving stream data in the same location. Other DNR divisions and outside cooperators have expressed interest in sharing this data system as well.

HYDSTRA is a collection of database management tools and hydrologic software packages that allows users to store and organize historical data, graphically analyze and edit hydrologic data, store and access digital photos, maps and other documents associated with stream files. HYDSTRA also offers various output formats, both graphical and tabular, to share stream data with others.

Flood forecast/warning system gage data are automatically downloaded into HYDSTRA via a satellite link. Stream flow and stage data collected at DNR special project sites or reported to DNR by hydropower facility operators are also stored in HYDSTRA. DNR floodwarning gage data can be accessed at the DNR/MPCA Cooperative Stream Gaging Web page and a National Weather Service Web site.




Greg Kruse Water Monitoring and Surveys Unit Supervisor 651-539-2108
Joy Loughry Field Operations Supervisor 651-539-2109
Lisa Pearson Field Operations Supervisor 651-539-2113
Jeremy Rivord Field Operations Supervisor 651-539-2115

St. Paul

Fred Bowen Hydrologist 651-539-2102
Erynn Jenzen Hydrologist 651-539-2126
Jacob Kolke Hydrologist 651-539-2130
Andrew Lindlof Hydrologist 651-539-2131
Will Long Hydrologic Technician 651-539-2129
Matthew Meyer Hydrologist 651-539-2110
Zach Moore Hydrologist 651-539-2112
Cory Peterson Hydrologic Technician 651-539-2124
Dan Plovnick Hydrologist 651-539-2114
Jill Pohjonen Hydrologist 651-539-2120
Carrie Robertson Hydrologist 651-539-2116
Brenda Stauffer Hydrologist 651-539-2118
Ryan Whittaker Hydrologic Technician 651-539-2106

Detroit Lakes

Josh Prososki Hydrologist 218-846-8481
Paul Thaemert Hydrologic Technician 218-846-8482
Colten VanZee Hydrologist 218-846-8483

Grand Rapids

Heather Emerson Hydrologist 218-327-4139
Jon Libbey Hydrologic Technician 218-999-7820
Jim Pogorelc Hydrologist 218-327-4110


Kyle Jarcho Hydrologist 507-537-6605
Ben Kiefer Hydrologist 507-537-6605
Jake Mickelson Hydrologic Technician 507-537-6605