How Do We Improve Watson Lake’s Water Quality and at What Cost? – Signals AZ

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Watson Lake is Definitely one of two reservoirs On the Granite Dells shaped Wiskinny the early 1900s when the Chino Valley Irrigation District constructed a dam on Granite Creek. The metropolis of Prescott purchased the reservoir and surrounding land in 1997 to protect it for leisure features As properly as to To grab floor water runoff from the native creeks for recharge features.

Picture by Jim David

Efficient administration of Watson Lake is essential to sustaining the recreation and recharge advantages for all who Revenue from The lovely scenic views, leisure alternatives, and trails surrounding the Lake.

In 2020, the City fulld a full research of Watson Lake, “The 2020 Watson Lake Reservoir Management Plan”: material/uploads/2020/12/Watson-Lake-Reservoir-Management-Plan.pdf.

Study Findings

The research found Watson Lake to be impaired with pollution, collectively with:

The research furtherly recognized Pretty A pair of value-effective measures To reintypeationrce water extreme quality:

  • Lake aeration
  • herbivorous fish
  • nutrient binding

These measures are included into the City’s fiscal yr 2022 price range.

Lake Aeration

Lake aeration Is not the regular golf course fountain that Includes thoughts most immediately. On this setting a quantity of aerators Can be located On The underside of the lake and air Can be pumped Proper down to them. As that air rises by way of the water column it provides oxygen to the lake and mixes with the lake water. This oxygen enhance significantly enhances and expands the fish habitat, the placeas concurrently stopping The discharge of phosphorus and ammonia. These are each catalysts for algal blooms which alter the lake’s pH stability.

Preliminary estimates for design and set up: $125,000 – $250,000.

Herbivorous Fish

Including herbivorous fish, Also referred to as grass carp or White Amur, would assist skinny out the jungle of aquatic weeds found at Watson Lake. This organic administration method Does not have The further gear or operational funds Associated to bodily weed administration. The metropolis will work with the Arizona Recreation and Fish Division So as to add fish to the lake the placeas meeting the relevant state ideas.

Preliminary value estimates So as to add herbivorous fish: $35,000 – $70,000

Nutrient Binding

Lanthanum impregnated clay is utilized to the lake and binds with the phosphorus which then falls to The underside the place It is not organicly out there. Phosphorus Is taken Beneath think aboutation to be the catalyst for algal blooms (the inexperienced icky stuff we see Immediately). The prices Associated to this are Counting on the water extreme quality (primarily phosphorus loading).

Preliminary value estimates to be Wiskinny the differ of $96,000 to $192,000.

Why Dredging is Not Useful


A full dredging of the Lake comes with An monumental value, roughly $17 million dollars. A partial dredging of the lake Can be cheaper, However It’d solely expose an older layer of nutrient-rich sediments and do Little or no So as To deal with the pollution of concern, nitrogen and phosphorus.

As Residents, What Can We Do?

As residents, We’d assist To reintypeationrce the water extreme quality of Watson & Willow Lakes by:

  • Maintaining septic methods with common pumping and seasonal seen inspections,
  • Not over-fertilizing our lawns and gardens
  • Choosing up after our pets (All by way of the place, Nobody Desires to see that!)

These all assist scale again the circulate of dietary vitamins into the lake and extend the effective lifespan of the lake water extreme quality enhancements thOn the City is placing in.

View the Watson Lake Reservoir Management Plan: material/uploads/2020/12/Watson-Lake-Reservoir-Management-Plan.pdf

Questions Might Even be submitted to [email protected]

Is Your small enterprise listed Wiskinny the official Prescott Valley Recreation Information?! 60,000 copies are being printed yrly! How are you going So as to add Your small enterprise? Name 928-257-4177 or e-mail [email protected] or fill out The type at

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