Current Projects

For the water year 2016, Utah has four large-scale projects using silver iodide:

  1. Central/Southern Utah/Tooele County Project Areas
    • Sponsored by Utah Water Resources Development Corporation.
  2. Northern Project Areas
    • Sponsored by Bear River Water Conservancy District and Cache County.
  3. West Uintas Project Area
    • Sponsored by Weber Basin Water Conservancy District, Provo River Water Users Association and Central Utah Water Conservancy District
  4. Uinta Mountains Project Area
    • Sponsored by Central Utah, Duchesne County, and Uintah Water Conservancy Districts.
  • Utah also has one small scale project using propane:
    • Emery and Sanpete Project Sponsored by Emery Water Conservancy District
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North American Weather Consultants is the cloud seeding contractor for the first four project areas. The total estimated cost for these projects is $ 489,500, of which the state will cost share $244,700 (50 percent).

Emery Water Conservancy District is operating a small scale project using liquid propane to seed the Wasatch Plateau above Joes Valley Reservoir. This will be enlarged to include portions of San Pitch River Drainage. The estimated cost for this project is $58,000, of which the state will cost share $29,000 (50 percent).
The Central/Southern Utah Project has operated continuously since water year 1974, with the exception of the extreme wet period from 1984-87. The project has 38 seeded seasons. The project area has 66 cloud seeding generators. Using a target and control regression analysis for December through March precipitation, the Central/Southern Utah Project Area indicates a 14 percent average increase in precipitation for this period.

Seeding began in the Tooele County Project area in 1976 and continued through the 1982 water year. Seeding resumed in 1989 through 1992 and again in 1996 to 2015. There are 30 seeded seasons. The project area has 11 cloud seeding generators. Target and control regression analysis show a December-March precipitation average increase of 12 percent.

The East Box Elder/Cache County Project Area has operated 27 years beginning in 1989. The project area had 23 cloud seeding generators from 1989-2001. Bear River Water Conservancy District (Box Elder County) did not participate in the project for the 2002 and 2003 seasons. The project was back in full operation for the 2004 to 2015 seasons and will continue this year. Target and control regression analysis shows a December-February precipitation average increase of 14 percent..

The West Box Elder Project Area has operated seventeen years. It was operated from 1989 through 1997, and 2000 through 2001. The project was not operated in 2002 and 2003 seasons. The project was operated during the 2004 to 2013 seasons and will continue this year. The project area has 10 cloud seeding generators. The target area has no precipitation gages; however, there are two snow courses. A target and control regression analysis shows an April 1 snow water content average increase of 20 percent.

The West Box Elder Project Area has operated eighteen years. It was operated from 1989 through 1997, and 2000 through 2001. The project was not operated in 2002 and 2003 seasons. The project was operated during the 2004 to 2015 seasons and will continue this year. The project area has 10 cloud seeding generators. The target area has no precipitation gages; however, there are two snow courses. A target and control regression analysis shows an April 1 snow water content average increase of 14 percent.

The West Uintas Project Area operated for nine years from 1989 through 1993, plus 1995, and 2001 through 2011. It was not operated during 2012. It was operated during water years 2013-2015. Weber Basin and the Provo River Water Users Association and the Central Utah Water Conservancy District are operating the project this year. The project area has 17 cloud seeding generators. Target and control regression analysis show a December-March precipitation average increase of less than one percent. Snow water equivalent target and control show a 4% increase

The Uinta Mountains Project Area operated for the years from 1975-1987. It was operated again for the years 2003 to 2014. It will be operated again this year. The project area has 24 cloud seeding generators. Target and control regression analysis showed a December-April precipitation increase of four per cent.

The table below shows a summary of the cloud seeding project areas operated last year. A map showing the location of the cloud seeding generators for the 2014-2015 Season follows.

2015  Large Scale Projects

Project Areas

Number of Cloud Seeding Generators 2014 Season

Prior Seeding Seasons

Precipitation Increase 2014

April 1st Snow water Equivalent Increase 2014

During Seeding Period

 During Seeding Period

Central/Southern Utah

66

38

14%

5%

Tooele County

11

30

12%

10%

East Box Elder/Cache County

23

27

14%

8%

*West Box Elder County

10

23

:

14%

West Uintas

14

18

0%

4%

South Slope Uinta Mountains

23

12

4%

4%

Abajo (Blue) Mountains

Total/ Weighted Average

147

 

11.3%

5.5%

*Snow Water Content Only


A study dated February, 2012 by the Division of Water Resources estimated an average annual increase in runoff of 181,700 acre-feet making the total cost of water developed approximately $2.27 per acre-foot
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