Stangler Wetland Reservoir Report

Last Updated: December 5, 2025

Stangler Wetland, located in Lonsdale, Minnesota, is a private wetland area primarily designated for flood risk reduction along the Cannon River.


°F

°F

mph

Wind

%

Humidity

Summary

Constructed in 2001 by the NRCS, this Earth-type dam stands at 15 feet tall and stretches 230 feet in length, with a storage capacity of 140 acre-feet. The wetland covers 13 acres and serves as a crucial water resource infrastructure in Rice County, Minnesota.

The dam at Stangler Wetland is regulated by the Minnesota Department of Natural Resources, with state jurisdiction and permitting in place to ensure its proper operation and maintenance. Despite being classified as having a low hazard potential, the condition assessment of the dam is rated as satisfactory, with inspection frequency set at every 8 years. The risk assessment for the wetland is moderate, highlighting its importance in managing water levels and mitigating flood risks in the area.

Stangler Wetland plays a vital role in protecting the surrounding community from potential flooding events, with its strategic location and design aimed at minimizing risks and ensuring water resource sustainability in the region. As a key asset in the flood risk reduction infrastructure, this wetland serves as a testament to effective water management practices and the collaborative efforts of both private and state agencies in safeguarding the environment and local communities from water-related hazards.

Year Completed

2001

Dam Length

230

Dam Height

15

River Or Stream

CANNON RIVER-OS

Primary Dam Type

Earth

Surface Area

13

Drainage Area

1

Nid Storage

140

Structural Height

17

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

17
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.