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It towers to the treetops, collapsing onto itself to create grassy caves. Dense and aggressive, it chokes out vegetation and clogs the waterways. Arundo donax has plagued parts of Chico for years but its established concentration in Little Chico Creek has reached a crisis point, critics say. Now, the city is partnering with the state Department of Water Resources and the geography department at Chico State University to do something about it, although tackling the invasive weed to the point of eradication will take years.

The reasoning for its eradication is both environmental and also because of its immense fire danger. Walking through a stretch of Little Chico Creek this week, Chico State professor Mark Stemen ducked under the thick canopy and used caution as he walked on slick carpets of the snapped-off reed.

He noted where homeless people have made sleeping spaces under Arundo canopies. Fire pits stand out charred and black in the middle of the caves.

Butte Environmental Council representative Mark Stemen shows areas of invasive Arundo donax growth along Little Chico Creek near Humboldt Park in October. Stemen, along with other citizens and city officials, are championing a plan for removal because of major fire danger risk and environmental damage.

Chico >> The city of Chico is rallying with Butte Environmental Council to eradicate an invasive weed clogging Little Chico Creek.On Tuesday, the Chico City Council will be asked to approve a joint application for a $1 million Urban Streams Restoration grant to eradicate arundo donax in the creek.

“We believe that when the city has to take a step back, the community can take a step forward,” said Mark Stemen of Butte Environmental Council, which will help spearhead the eradication effort. “We pointed out the problem. We also wanted to be part of the solution.”A class of his students at Chico State University mapped Little Chico Creek last fall, noting every location of arundo, invasive species and habitat that will need to be preserved.

Chico >> The city of Chico is rallying with Butte Environmental Council to eradicate an invasive weed clogging Little Chico Creek.

On Tuesday, the Chico City Council will be asked to approve a joint application for a $1 million Urban Streams Restoration grant to eradicate arundo donax in the creek.

The city will subcontract the restoration work to a local riparian restoration firm, and engage the California Native Plant Society for its expertise and volunteer labor. The Butte Environmental Council will coordinate community outreach and education, and Chico’s Stream Team will provide citizen water quality monitoring.