Federal authorities continue to battle illegal marijuana trafficking as they gear up for this year's harvest season. Officials announced several convictions for a number of major busts in National Forests during 2017.

In a news release Monday, the Department of Justice provided updates on the following cases:

United States v. Santos Ramirez-Alvarez and Santos Ramirez-Carrillo, Case No. 17-cr-338: On two islands in the Colorado River near DeBeque, Colorado, approximately 9,100 marijuana plants were found growing on BLM land. Water from the Colorado river was diverted to irrigate the grow, while money derived from the grow went to individuals in Sinaloa, Mexico. Two defendants were arrested, charged, and pled guilty to a conspiracy to manufacture and distribute marijuana. They were sentenced to 57 months and 60 months in prison, respectively.

United States v. Fernando Esquivel Herrera, No. 17-cr-402: In the White River National Forest, near Placita, Colorado, approximately 2,700 marijuana plants were found growing on about 8 acres of public land, with another 3,000 plants already harvested. Multiple bottles of WD-40 were found at the site. The defendant was charged with conspiracy to manufacture and distribute marijuana plants, along with other crimes. He was sentenced to 60 months in prison.

United States v. Neil Andrew McKay, No. 17-cr-403: On BLM land near Whitewater, Colorado, approximately 100 marijuana plants were located. The defendant – who was homeless -- was found with a loaded handgun in his possession. He was sentenced to 12 months and 1 day in prison.

United States v. Vincente Medrano Duque, No. 17-cr-320: In the San Isabel National Forest near Rye, Colorado, approximately 7,500 plants were located on a grow affecting approximately four acres. The defendant was charged and pled guilty to conspiracy and possession with intent to distribute marijuana plants, land depredation, and illegal reentry. Sentencing is scheduled for the end of August.

United States v. Danilo Jemenez-Lopez and Margarito Yepez-Sanchez., No. 17-cr-372: In the San Isabel National Forest near Rye, Colorado, approximately 14,000 marijuana plants were located on a grow affecting approximately twelve acres. Two defendants were charged, and one pled guilty to conspiracy to manufacture, distribute, and possess marijuana, as well as land depredation. The case against defendant Jemenez-Lopez is still pending.

United States v. Cutberto Reyes-Martinez, Gildardo Mendez-Arizmendi, Martin Sandoval-Arizmendi, and Pedro Fernando Segovia Rosales., No. 17-cr-375: In the San Isabel National Forest near Salida, Colorado, approximately 4,000 marijuana plants were located on a grow affecting approximately seven acres. Four defendants were charged and pled guilty to conspiracy and possession with intent to distribute marijuana plants. Two defendants were also charged and pled guilty to illegal reentry. The defendants were sentenced individually to 20, 24, 60 and 24 months in prison.

United States v. Virgilio Alain Reyes Cervantes and Erik Pimental Magana Plata, No. 17-cr-431: In the San Isabel National Forest near Rye, Colorado, approximately 9,000 marijuana plants were found on a grow affecting approximately seven acres. Two defendants were charged with conspiracy and possession with intent to distribute marijuana. They were sentenced to 15 and 21 months in prison, respectively.

Altogether, the DOJ says there were more than 71,000 marijuana plants found across 38 acres of Colorado public lands in 2017. Those numbers do not include the islands on the Colorado River. According to the department of justice, more than 5,000 pounds of trash was left behind at the grow sites and a number of pesticides had to be removed. It took hundreds of hours to clean up each site.

“Public lands are just that – they’re public and belong to all of us,” said U.S. Attorney Troyer according to the release sent out by the Department of Justice. “These black marketers abuse our land, our water, our animals and plants. With these prosecutions we motivate black marketers to make less harmful occupational choices.”