8013

• UCREFRP Catalog Number: 8013
• Author: Pontius, D. and I. SWCA.
• Title: Colorado River Basin Study.
• USFW Year: 1997.
• USFW - Doc Type: Tucson, Arizona.
• Copyright Material: NO

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Background Information

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Table 5.-Water allocations in the Colorado River Basin
Apportionment
Entity (maf/year) Authority
Upper Basin 7.5 1922 Colorado River Compact. (The Upper Basin has
the right to use 7.5 maf only if that quantity is
available after it has satisfied its delivery requirements
of 7.5 maf/year to Lower Basin plus the amount
required to satisfy the Mexican Treaty obligation.)
Arizona 0.05 1948 Upper Colorado River Basin Compact
Colorado 3.86 1948 Upper Colorado River Basin Compact.
(Colorado is apportioned 51.75% of the remaining
flows after the Upper Basin's delivery requirements
have been met.)
New Mexico 0.84 1948 Upper Colorado River Basin Compact (New
Mexico is apportioned 11.25% of the remaining flows
after the Upper Basin's delivery requirements have
been met.)
Utah 1.71 1948 Upper Colorado River Basin Compact (Utah is
apportioned 23% of the remaining flows after the
Upper Basin's delivery requirements have been met.)
Wyoming 1.04 1948 Upper Colorado River Basin Compact
(Wyoming is apportioned 14% of the remaining flows
after the Upper Basin's delivery requirements have
been met.)
Lower Basin 8.5 1922 Colorado River Compact
Arizona 1 2.8 1963 U.s. Supreme Court decision Arizona
v. California
California2 4.4 1963 U.s. Supreme Court decision Arizona
v. California
Nevada3 0.3 1963 U.s. Supreme Court decision Arizona
v. California
Additional 1.0 Article IIl(b) of 1922 Colorado River Compact
Mexico 1.5 Mexican Water Treaty of 1944
Total 17.5

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1 Plus 46% of the surplus water available, as determined by the Secretary.
2 Plus 50% of the surplus water available, as determined by the Secretary.
3 Plus 4% of the surplus water available, as determined by the Secretary.

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