Ground Water Management Areas of Thousand Springs and American Fall

Lakes ... Cities

D American Falls Ground Water Management Area D Thousand Spri·ngs Ground Water Management Area N Interstate 84 '/\/ Rivers ·o Eastern Snake Plain Aquifer

http://www.idwr.state.id.us/info/pio/issues/ESPAGWMA/GWMA%200verall.jpg

Page 1 of 1

1/18/2002

THOUSAND SPRINGS & AMERICAN FALLS GROUND WATER MANAGEMENT AREAS

Potential Ground Water Rights Impact Areas

The land area of the Ground Water Management Areas is much larger than the actual areas where ground water rights may be curtailed. There is no plan at this time to curtail all ground water rights through the entire GWMA.

The Thousand Springs GWMA covers some 340,000 acres of land. Initial estimates are that approximately 34,500 acres of land will be impacted.

The American Falls GWMA covers some 776,000 acres of land. Preliminary estimates are that approximately 50,500 acres of land will be impacted.

The colored lines inside the GWMAs in the map below outline the potential impact areas where ground water rights will most likely be curtailed. Initial estimates are that approximately 1,000 water rights in the two GWMAs combined face curtailment.

IDWR is using a sophisticated computer-modeling program to determine exactly which water rights need to be curtailed to produce the increase in spring flows to the river. The modeling program is based on a 3-mile grid system. To determine which rights to curtail, the grid system starts roughly at the edge of the river and move outwards in 3-mile segments on one or both sides of the river. That means, in essence, that the closer a ground water diversion is to the river, the greater likelihood it will be curtailed.

The first ground water rights to be curtailed will be those that are inside the 0-3 mile grid. If curtailing those rights does not produce the necessary increase in spring flows, then a second 3-mile grid would be added. That would mean ground water rights in the 3-6 mile area could also be curtailed.

Ground Water Impact Areas Within Thousand Springs and American Falls Ground Water Management Areas

13E 14E 15E 16E 17E 18E 19E 20E 21 E 22E 23E 24 25E 26E 27E 28E 29E 30E 1 32E 33E 34E 35E 36E

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02S

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13S

Date Prepared: August 24, 2001

10 0 10 20 Miles - -- -

N

+ C:J American Falls Impact Area c=i Thousand Springs Impact Area

s Cities /\/ Major Rivers

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American Falls GWMA CJ Eastern Snake Plain Aquifer

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j - IDWR Hydrologic Basin 36 ~

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19 20 21 22 23 24 # 1-, ~ 1~·-~ I I 1 I ....

~ 1 30 29 28 27 26 25 ~i Twin Falls ~ 31 32 33 34 35 36

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