Sustainable use of groundwater in the Little Rock Creek area

water flowing through little rock creek

Groundwater use is affecting Little Rock Creek

Groundwater use is vital to the people and economy in the Little Rock Creek Area. Focused analysis of groundwater flow and stream ecology has clarified that pumping from high-capacity wells has, at times, diverted groundwater that would have otherwise flowed underground into Little Rock Creek. This diversion of groundwater is not sustainable as it has negatively impacted the habitat and contributed to water quality impairments in this unique, cold water stream.

The Minnesota Department of Natural Resources wants individuals, communities and businesses to continue using groundwater. However, groundwater use must be sustainable as described in Minn. Statute 103G.287, Subd. 5. Sustainability Standard.

 

DNR Commissioner's Order sets path to sustainable use

In April 2024, the Minnesota Department of Natural Resources issued a Commissioner’s Order to protect the ecology of Little Rock Creek. With this action, the DNR: 

  • Establishes a sustainable diversion limit for Little Rock Creek 
  • Recognizes that a water use conflict exists among agricultural production water users within a zone near Little Rock Creek (called the Zone of Irrigation Influence)
  • Gives opportunity to permit holders to submit a plan to the DNR to resolve the water use conflict that will keep water use impacts below the sustainable diversion limit  
  • Withholds consideration of applications for additional water use within the Zone of Irrigation Influence until the conflict is resolved 

In order to assist water users in developing a plan to resolve the water use conflict, the DNR has committed to funding a third-party vendor to work with water users and the DNR to develop engineering, governance and economic analyses information that will help to resolve the water use conflict. 

 

Action plan

Since January 2016, the DNR has met with residents, permitted water users and local government leaders in the Little Rock Creek Area. We discussed, analyzed and planned for the sustainable and continued use of groundwater in the area. These discussions helped form the DNR action plan. Since the plan was finalized in 2018, the DNR has worked to complete the actions listed in the plan. These actions are designed to first gain a more detailed understanding of water flows in the area and then to propose a list of actions that will ensure a sustainable groundwater supply while protecting the Little Rock Creek ecosystem.

 

DNR actions

Protected flow and sustainable diversion limit - all actions completed

According to Minnesota Rules, a stream's "protected flow" is the amount of water required in the watercourse to meet the needs of fish and wildlife habitat, water quality and priority downstream users. Once a protected flow is established for a stream, the DNR can calculate the amount of groundwater use that is sustainable.

In order to inform future decisions about a protected flow and a sustainable diversion limit for Little Rock Creek, the DNR will do the following data collection and analysis before 2019:

  • Completed = Expand collection of stream flow and temperature data on Little Rock Creek.
  • Completed = Continue monitoring groundwater levels throughout the Little Rock Creek Area.
  • Completed = Measure and analyze fish habitats in Little Rock Creek.
  • Completed = Finalize a groundwater flow analysis.
Cumulative use and negative impact - all actions completed

In relation to water appropriations, negative impact is a change in hydrology sufficient to cause ecosystem harm or alter riparian uses long-term. In order to determine if cumulative use is having a negative impact on Little Rock Creek, the DNR will work with the public to:

  • Completed = Establish a sustainable diversion limit for cumulative groundwater appropriations in the Little Rock Creek Area.
  • Completed = Determine whether cumulative use is greater than the sustainable diversion limit.
  • No longer needed (see sustainable diversion limit) = Establish a protected flow for Little Rock Creek.
Hydrology and biology - most actions completed

Important natural resources in the Little Rock Creek Area include wetland complexes, native prairie remnants and two cold water streams. There are also forested areas, warm water streams and the northern edge of Little Rock Lake.

In order to improve the hydrology and biology of Little Rock Creek, the DNR will evaluate the impact and feasibility of a variety of management actions. Then, the DNR will work with stakeholders to determine the most appropriate management actions to keep permitted water use within the sustainable diversion limit. The management actions to be evaluated include:

  • Completed = Managing water levels differently in the Sartell Wildlife Management Area.
  • Analysis completed = Pumping groundwater into Little Rock Creek and/or Bunker Hill Creek during times of low stream flow (stream augmentation).
  • Underway by others = Enhanced water conservation by current water appropriation permit holders.
  • Analysis completed = Additional groundwater recharge.
  • Analysis completed = A new rural water distribution system to supply irrigation water from wells that are farther away from the creek.
  • Underway by others = Installing vegetated riparian buffers to improve temperature, sediment, and other water quality aspects of the creek.
  • Future action = Amend as needed, existing water appropriation permits inside zone of irrigation influence to resolve water use conflict.
Water use - all actions completed

In order to more accurately estimate the amount of water used in the Little Rock Creek Area, the DNR will do the following over the next several years:

  • Completed = Work with all water appropriation permit holders to evaluate the accuracy of their reported water use estimates. This will start with a group of irrigators who volunteered to compare their own existing water use estimates to flow meter measurements.
  • Completed = Clarify the number of livestock operations in the Little Rock Creek area and their annual groundwater use.
  • Completed = Clarify the extend of non-permitted groundwater uses in the area, including low-volume domestic wells and any high-volume users operating without permits.
Permitted water use - all actions completed

In order to support the continued permitting of water use in the Little Rock Creek Area, the DNR will do the following:

  • Completed = Issue only time-limited water use permits for new permits on permit amendments in the Little Rock Creek Area to assure compliance with Minnesota rule and statue. "Limited" means that permits are in force through December 2025.
  • Completed = Extend all existing limited water use permits through December 2022 to allow for continued water use while data gathering and analysis are completed.
  • Completed = (new action) Extend all existing limited water use permits through December 2025 to allow for resolution of the water use conflict.
  • Completed = Approve water use permit transfer if there are no changes in volume and all other legal requirements are met.
Meeting summaries

Library

 

2024 project updates
2023 project updates

At the DNR-hosted stakeholder meeting March 16, 2023 in the City of Rice, the public heard about the DNR’s proposed Commissioner’s Order that lays out the next steps to provide for permitted water use while avoiding negative impacts to Little Rock Creek. A durable solution is best achieved with input from the public. This opportunity to provide feedback is open until May 15, 2023.

2022 project updates
2021 project updates

June Stakeholder Meeting Update

Water analysis complete
In the spring of 2021, the DNR has completed its scientific analysis of water levels, groundwater flow, fish habitats and water temperature for Little Rock Creek. This work was guided by the “Sustainable Use of Groundwater in the Little Rock Creek Area: A DNR Action Plan” and will provide a foundation for discussions about sustainable use of groundwater in the Little Rock Creek Area. DNR invites the public to learn more about the analysis (linked below) and to ask questions of DNR staff that conducted the research.

All of this work has been guided by the “Sustainable Use of Groundwater in the Little Rock Creek Area: A DNR Action Plan.” The plan’s aim is to assure that use of groundwater remains sustainable and consistent with state laws. Groundwater use is sustainable as defined by Minnesota Statutes when area groundwater is able to supply the needs of future generations and the proposed use will not harm ecosystems, degrade water, or reduce water levels beyond the reach of public water supply and private domestic wells.

Summary of sustainability analysis for Little Rock Creek
The groundwater flow analysis completed in March 2021 by the DNR shows that groundwater use in the Little Rock Creek area is reducing some of the seasonal low flows by more than 20% in four of twelve years analyzed. The associated fish habitat analysis showed that this amount of change in streamflow results in a loss of fish habitat during those periods.

Based on our analysis of fish habitats and species in Little Rock Creek, it appears that a sustainable diversion limit of 15% of the August median baseflow would avoid adverse impacts and meet the requirements for sustainable use in Minnesota Statutes.

The DNR’s temperature analysis also shows that the impoundment in the Sartell Wildlife Management Area contributes to raising water temperatures in Little Rock Creek below the impoundment dam. DNR wildlife managers are currently exploring options to adjust their management to improve conditions in the stream, while also preserving the benefits the impoundment provides for waterfowl and waterfowl hunting.

Next steps
In addition to the June public meeting, the DNR will continue consulting with stakeholders, consisting of individual conversations, availability for questions, meetings and exploration of options, starting with the ideas laid out in the Sustainable Use of Groundwater in the Little Rock Creek Area: A DNR Action Plan. Most importantly, we will all need to continue listening to each other – agency staff and stakeholders alike – and build on the partnership we have begun.

Working together, we can (and will) plot a course that allows us to continue reaping its economic and ecological benefits, securing them not only for us today, but also for future Minnesotans.

 

Questions

  • Mark Hauck, Little Rock Creek Area Project Manager, 320-223-7846
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