...wrong question. The Colorado river is not the largest river emptying the Gulf of Mexico.... because the Colorado River empty its waters in the Sea of Cortez, in the Pacific coast of Mexico, not in the Caribeean where the Gulf of Mexico is located.

Now that being said, the waterways that empty into the Gulf of Mexico from USA, Mexico and Cuba are composed of 20 major rivers and 150 smaller ones. The annual freshwater inflow to the Gulf is approximately 280 trillion gallons with the 85% coming from the US and 64% originating from the Mississippi River alone, this the largest waterway emptying into the Gulf of Mexico.

Other waterways from the US are:

Crystal
Suwanee
Chatahoochee
Alabama
Mobile
Sabine
Mississippi
Atchafalaya
Trinity
Guadalupe
Brazos
Rio Grande

Other waterways from Mexico are:

Panuco
Tuxpan
Tecolutla-Necaxa
Nautla
La Antigua
Jamapa-Cotaxtla
Papaloapan
Coatzacoalcos
Tonala
Grijalva
Usumacinta
Candelaria

http://earthobservatory.nasa.gov/images/imagerecords/4000/4982/Gulf_of_Mexico.OSWA2004312.jpg
Source(s):
http://www.gulfbase.org/facts.php

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