FY 2023 Quinault Indian Nation Lake Quinault Nutrient Enrichment

Salmonid Habitat Restoration and Acquisition

Water Quality
Project ID23-QUIN-01
Recovery Domains -
Start Date06/01/2024
End Date05/31/2026
Last Edited05/16/2024
1 - 1


The project includes the following elements: 1) fertilizer purchase and delivery; 2) fertilizing Lake Quinault with liquid nitrogen and phosphorus fertilizers; 3) monitoring of a suite of physical, biological, and water chemistry variables relevant to lake nutrient enrichment effectiveness monitoring (Ashley & Stockner 2003); 4) sample collection and processing; 5) data entry, data QA/QC, and database management; 6) data analysis and reporting; and 7) equipment maintenance/repair and operating expenses. The nutrient prescription is intended to enhance production of edible phytoplankton and zooplankton, the food source of sockeye fry, while avoiding the occurrence of nuisance algae responses. The fertilizer prescription will be developed in February then applied weekly by boat to surface waters of Lake Quinault from April to October using a blend of liquid fertilizer consisting of urea ammonium nitrate (UN 32) and ammonium polyphosphate (10-34-0).

The monitoring will also provide data to identify physical influences that affect lake productivity (e.g. turbidity influence on euphotic zone depth). In 2024, QIN will also initiate an in-depth assessment of the Lake Quinault Fertilization Program – through the compilation and analysis of historic fisheries and limnology data before and during the lake fertilization period.

Project Benefit    

Increased primary productivity is the most consistent measure of nutrient supplementation response in lakes. The prescribed nutrient load is equivalent to a yield of approximately 0.9 ug/L of chlorophyll biomass.


Metric Completed Originally

Funding Details

No Funding data has been entered for this project.

Project Map


Lake Quinault    

  • Worksite Identifier: Lake Quinault
  • Start Date:
  • End Date:
Area Description
The project worksite is Quinault, Washington. The fertilizer storage facility and base of field operations is located at Lake Quinault Hatchery (Pen Rearing) 131 Old State 9 Road - Quinault, Washington 98575

Location Information

  • Basin: Washington Coastal (171001)
  • Subbasin: Queets-Quinault (17100102)
  • Watershed: Upper Quinault River (1710010204)
  • Subwatershed: Quinault Lake (171001020408)
  • State: Washington
  • Recovery Domain:
  • Latitude: 47.47011465
  • Longitude: -123.8692474


  • Quinault Lake Sockeye Salmon ESU




  • C.0 Salmonid Habitat Restoration and AcquisitionY (Y/N)
    •      . . C.0.a Habitat restoration and acquisition funding .00
    •      . . C.0.b Length of stream treated/protected
    •      . . C.0.c
      Project identified in a Plan or Watershed Assessment
    •      . . C.0.d.1 Project Monitoring (LOV)
    •      . . C.7 Water Quality ProjectY (Y/N)
      •      . . . . C.7.a Water quality funding
      •      . . . . C.7.b.1 Total acres of area treated for water quality
      •      . . . . C.7.b.2 Total acre feet of water treated for water quality (Acre feet)
      •      . . . . C.7.c Water Quality Limitation Treated (LOV)
      •      . . . . C.7.g.1 Carcass or nutrient placementY (Y/N)
        •      . . . . . . C.7.g.2 Select the type of nutrient used (LOV)
        •      . . . . . . C.7.g.3 Pounds (Lbs) of carcasses, fish meal bricks, analog or other fertilizer placed in or along stream (lbs)
        •      . . . . . . C.7.g.6 Acres treated with nutrients