Does the Lake Change?​

Sahuarita Lake is relatively shallow. Shallow lakes warm and cool more quickly than deeper lakes and are more affected by changes in air temperature and sunlight.

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Warm water holds less dissolved oxygen than cold water. At the same time, fish, bacteria and other organisms generally require more oxygen as water temperatures rise. These conditions can increase biological activity, aquatic plant growth and algae growth, particularly during warmer portions of the year.

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Wind, storms and runoff can also introduce or redistribute sediment, nutrients and organic material. Together, these natural and environmental factors mean that the lake may look different from one season—or even one week—to the next.

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​The Lake’s Annual Cycle​

Winter: Cooler Water and Trout Season

Cooler temperatures generally allow the water to hold more dissolved oxygen. Residents may notice clearer water and less visible algae during portions of the winter.

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Rainbow trout are typically stocked during the cooler winter season through the Arizona Game and Fish Department’s Community Fishing Program. Stocking dates and conditions can change, so anglers should always review the current schedule before visiting.

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Spring: Warming Water and Increased Activity

As temperatures rise, biological activity within the lake begins to increase. Fish, plants, algae and beneficial bacteria all respond to warmer conditions and longer periods of sunlight.

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Spring is also generally part of the channel catfish stocking season. Seasonal temperature changes may cause the lake’s water layers to mix, circulating nutrients through the water and sometimes contributing to an algae bloom.

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Summer: Heat, Oxygen and Algae

Summer is one of the most challenging times of year for a shallow desert lake.

As the water becomes warmer, it holds less dissolved oxygen. Increased sunlight and available nutrients can also encourage algae and aquatic vegetation to grow more quickly.

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Fish stocking is suspended during the hottest portion of the summer to reduce the risk of thermal stress. The Arizona Game and Fish Department currently notes that Community Fishing Program stockings do not take place between late June and mid-September because of extreme heat.

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Fall: Cooling Water and Seasonal Mixing

As temperatures begin to fall, the lake may experience another period of seasonal mixing. Nutrients that have settled into lower portions of the lake can move toward the surface, sometimes resulting in a noticeable algae bloom.

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Channel catfish stocking generally resumes during the cooler fall season, followed by trout stocking as winter approaches.

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​What Is Lake Turnover?​

Lake turnover is a seasonal process in which changes in temperature cause water from different depths to mix.

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During periods of stable weather, water can form temperature-based layers. As seasonal temperatures change, those layers begin to mix. This movement helps circulate oxygen and nutrients throughout the water.

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When nutrient-rich water moves closer to the surface, increased sunlight can contribute to algae growth. At Sahuarita Lake, seasonal mixing is generally most noticeable during:

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Spring and early summer

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Fall and winter

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A visible algae bloom during these periods does not necessarily mean the lake has been neglected. It can be part of the lake’s normal seasonal cycle. When larger blooms occur, Town staff evaluate conditions and begin appropriate treatment. Treatment and recovery may take approximately four to eight weeks.

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What Residents May Notice​

Green or Cloudy Water

A green tint or reduced water clarity may be caused by planktonic algae—tiny organisms suspended in the water. Algae form an important part of the aquatic food web, and some algae growth is expected in a healthy lake.

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A change in color does not, by itself, identify the type of algae present or indicate that an emergency exists. Visitors should continue to follow all posted signs and park regulations.

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Small Patches or Mats of Algae

Residents may occasionally see algae collecting near the shoreline or in areas affected by wind and water movement. Town staff monitor lake conditions and may use approved treatments when growth becomes excessive.

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A Blue or Darker Water Color

Lake dyes may be used as a management tool to limit the amount of sunlight available to submerged plants and algae. When applied, these products may give the lake a deeper blue or darker appearance.

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The color is intentional and may also make it more difficult for birds of prey to see stocked fish in shallow water.

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Bubbles or Movement on the Water

Sahuarita Lake uses subsurface diffusers to help circulate the water and support dissolved oxygen levels. Bubbles or localized water movement may indicate that the aeration system is operating.

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Temporary Treatment Activity

Residents may occasionally see Parks maintenance personnel inspecting the lake or applying approved lake-management products. Treatments may be used to control excessive algae or invasive aquatic vegetation and to reduce the risk of oxygen loss as vegetation dies and decomposes.​

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How the Town Manages the Lake​

Managing a man-made lake is an ongoing process rather than a one-time treatment. Town staff use several approaches to support the lake’s health, function and recreational value.

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These efforts may include:

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• Maintaining water levels through groundwater pumping

• Operating aeration and circulation equipment

• Monitoring algae and aquatic vegetation

• Applying approved algaecides or aquatic herbicides when appropriate

• Managing invasive plants and nonnative wildlife

• Supporting habitat for fish and other aquatic life

• Coordinating fish stocking with the Arizona Game and Fish Department

• Inspecting park and lake infrastructure

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The goal is not to remove every plant or algae organism from the water. The goal is to maintain a balanced lake that can continue supporting aquatic life and community recreation.

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The Town of Sahuarita has conducted significant work to maintain and upkeep Sahuarita Lake Park. Below is a comprehensive list of public meetings with links to revisit the meeting recordings, agendas, and presentation materials.

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Fish Stocking and Fishing​​

Sahuarita Lake participates in the Arizona Game and Fish Department’s Community Fishing Program.

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The lake is generally stocked with:

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Channel catfish during portions of the spring and fall

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Rainbow trout during the cooler winter months

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Sunfish and smaller largemouth bass periodically to help support a balanced fish population

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Stocking dates are subject to change because of water temperature, fish availability, delivery conditions and the suitability of an individual lake. Anglers should consult the official stocking schedule before planning a trip.

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A valid Arizona fishing license may be required, and all Arizona Game and Fish Department regulations remain in effect.

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You can view the current fish stocking schedule by clicking the link below:

https://www.azgfd.com/fishing-2/where-to-fish/fish-stocking-schedule/

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You can review fishing licenses and regulations by clicking the link below:

https://www.azgfd.com/fishing-2/licenses-and-regulations/

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Wildlife and the Lake​

A healthy lake depends on balance among fish, plants, insects, birds and other wildlife.

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Residents can help protect that balance by not releasing unwanted pets, fish, turtles or other animals into the lake. Introduced species can compete with native wildlife, damage habitat and make lake management more difficult.

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Visitors should also avoid feeding wildlife. Feeding can change animals’ natural behavior, attract excessive numbers of animals to one location and add unnecessary nutrients and waste to the water.

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When Should Something Be Reported?

​Many seasonal changes are normal, including temporary discoloration, reduced clarity, small areas of algae and changes associated with lake treatment.

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Residents are encouraged to contact the Town when they observe:

• A sudden or widespread number of dead or distressed fish

• Suspected dumping or a substance entering the lake

• Damaged aeration, irrigation or park equipment

• A strong and persistent odor accompanied by a significant change in lake conditions

• Unsafe activity or a violation of posted park rules

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Photos, the approximate location and the time the condition was observed can help staff evaluate a report.

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Help Protect Sahuarita Lake​

Every visitor can help care for the lake and surrounding park.

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Please remember:

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• Swimming is not permitted for people or pets without special authorization.

• Do not clean fish in the park.

• Do not feed, hunt or trap wildlife.

• Do not release fish, turtles or other animals into the lake.

• Glass containers are not permitted.

• Keep pets leashed and remove pet waste.

• Follow all posted fishing and watercraft regulations.

• Observe restrictions involving motorized vehicles, gas-powered boats, electric bicycles and scooters.

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Sahuarita Lake is not intended or maintained as a swimming lake. Visitors should not enter the water unless specifically authorized as part of an approved activity.

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For complete park regulations, review Title 12 of the Sahuarita Town Code by clicking the link below:

https://ecode360.com/49030076​​​​​