My thought in looking at the map (without an elevation chart in hand) would be it would first go up the colorado river itself as the ocean rises, then into Laguna Salada (a Baja California Lake in northern Mexico). Then likely it would move across the border into the U.S. and fill up completely the minus 245 feet below sea level area of the Salton sea etc.
However, the lowest point below sea level in the U.S. is NOT the Salton Sea but rather Death Valley itself. However, I don't think that is where the ocean is going because of Mountain ranges between Death Valley and the Gulf of California (at least initially during sea level rise between now and 2100.
However, likely most of Florida would be underwater by 2100 or parts of Florida would be islands by then. So, by the time Florida is islands the ocean would stretch up to Indio at that point. However, I suppose (knowing how water always finds a way, at some point the ocean could return to Death Valley too.
I FOUND AN ELEVATION FLOODING MAP!
Flood Map: Water Level Elevation Map
http://www.floodmap.net/
Using the above application you can plot the flooding that would bring water up to Indio from the Gulf of California yourself.
10 meters of water brings water from the Gulf of California and completely covers Indio by the way.
a meter is 39.37 inches or approximately 3 feet per meter.
The highest point in the flood plain is Nuevo Leon so at 9 meters of flooding it can't seem to make it over this rise. So, without at least 10 meters elevation (which could be achieved even by storm surge of that height at some point where water comes up as far as Indio and the Salton Sea at some point in the future. However, the winds likely would have to come right up the Gulf of California at over 100 mph to accomplish this via a hurricane or something like this during this century for this to happen before 2100 it is my present belief.
However, for example, a tidal wave coming up from Chile might also accomplish the same thing of 30 to 100 feet in height as well. However, if this sort of thing happened, San Diego, Long Beach and possibly parts of Los Angeles would also be underwater too.
For example, 9 meters of water (like from a tidal wave) puts most of Coronado Island underwater off San Diego as well as large parts of National City, Chula Vista and San Diego underwater.
9 meters of water also puts most of Huntington Beach, Seal Beach and Sunset Beach and parts of Long Beach underwater including the San Diego Freeway (the 405). In some places water goes up as far as Carson and Cypress in the Los Angeles area.
Most of Marina Del Rey would be underwater at 9 meters of flooding as well.
Point Hueneme, point Magu and most of Oxnard would be underwater at 9 meters of flooding as well. Most of Carpenteria and Santa Barbara would be underwater too at 9 meters of flooding. And the SAnta Barbara airport and most of Goleta would also be underwater at 9 meters of flooding too.
One again 9 meters converts to 29.5275 feet or approximately 29 1/2 feet of water.
Once again this is what 10 meters does to Northern Baja California in Mexico up as far as Indio:
First the water goes into Laguna Salada
Then it goes up a slightly different route and inundates Mexicali completely under water, then it inundates Anza, El Centro and Imperial.
Then it covers the Salton Sea almost to Ocotillo wells
Then it goes north and covers Mecca, Thermal, Coachella and Indio.
However, La Quinta, Bermuda dunes and Palm Desert and points north stay out of the water at 10 meters of flooding from the Gulf of California.
Since in reality the ONLY thing really that separates the ocean from the Gulf of California to Indio is in reality the Colorado River Delta and this likely will wear away during this century this is something people in this area might need to be thinking about during the next 100 years or so because as sea levels rise this is what is coming your way in time.
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