Here's a photomontage by Trópico Verde showing one conception of what the Usumacinta at Boca del Cerro could look like once a dam is constructed. (click for larger version)
I found it on this site:
Parks Watch - Strengthening Parks To Safeguard Biodiversity
Parks Watch is a project of the Center for Tropical Conservation at Duke University. Also from their site, this map of fires in the region in April, 2003:

| June 2006 | ||||||
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 1 | 2 | 3 | ||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | 26 | 27 | 28 | 29 | 30 | |