Advocacy
Thompson Divide Coalition
A conservation group working on Thompson Divide.
Fighting for Thompson Divide

7 public places under threat in Colorado
10 groups have them in their care
The defenders
10 groups are on the record for Colorado, each tied to it by a source our editors read, in the order they carry the weight. The other 2 are likely to care: a guess from mission and footprint, with no source tying them to this fight. Give directly; nothing routes through us.
Leading the fight
Advocacy
A conservation group working on Thompson Divide.
Fighting for Thompson Divide
On the ground
Legal · Denver, CO
Joined the formal challenge to the January 2026 replacement lease sale and previously sued BLM over the Roan Plateau leases
Fighting for Colorado BLM Lease Sale·1 live federal case
8 staff + 100 volunteers81¢ to the workFounded 2007
Coalition · Durango, CO
Shaped the 2010 management plan, has fought oil and gas leasing decisions inside the monument for two decades, mobilized against the 2017 monument review, and states it continues to defend CANM.
Fighting for Canyons of the Ancients
9 staff + 20 volunteers89¢ to the workFounded 1986
Legal · Tucson, AZ
Led the coalition suit against the Uinta Basin Railway, whose oil trains would run the river corridors below the monument
Fighting for Dinosaur·15 live federal cases across all their work
242 staff + 19 volunteers88¢ to the workFounded 1989
Also in the fight
Legal · Santa Fe, NM
Named petitioner against the Uinta Basin Railway over habitat destruction in the basin
Fighting for Dinosaur·4 live federal cases across all their work
41 staff + 20 volunteers78¢ to the workFounded 1996
Advocacy · Oakland, CA
Named petitioner in the Uinta Basin Railway litigation
Fighting for Dinosaur and Colorado BLM Lease Sale·4 live federal cases across all their work
10,895 volunteers81¢ to the workFounded 1892
Advocacy · Washington, DC
Among the groups formally challenging the no-public-input replacement lease sale
Fighting for Colorado BLM Lease Sale and Canyons of the Ancients·3 live federal cases across all their work
178 staff + 32 volunteers75¢ to the workFounded 1935
Legal · San Francisco, CA
Represented San Juan Citizens Alliance and partners in a 2002 settlement that added archaeological and wildlife oversight to a seismic survey and deferred new oil and gas leasing in the monument pending the management plan EIS.
Fighting for Canyons of the Ancients·5 live federal cases across all their work
698 staff + 33 volunteers81¢ to the workFounded 1971
Legal · New York, NY
Co-filer of the challenge over BLM’s failure to allow public comment on the sale
Fighting for Colorado BLM Lease Sale·3 live federal cases across all their work
829 staff + 5 volunteers76¢ to the workFounded 1970
Advocacy · Washington, DC
Joined the March 2026 challenge to the replacement oil and gas lease sale
Fighting for Colorado BLM Lease Sale·4 live federal cases across all their work
165 staff + 80 volunteers71¢ to the workFounded 1947
Likely to care: a guess from mission and footprint, no source ties them to this fight
Advocacy · Durango, CO
They work only in Colorado
1 live federal case across all their work
26 staff79¢ to the workFounded 2007
Stewardship · Golden, CO
They work only in Colorado
42 staff + 545 volunteers82¢ to the workFounded 1994
On the ground in Colorado
The national muscle
The places
Each has its own page with the groups on the record for it. The most urgent first.
On watchBrowns Canyon National MonumentInterior review of national monument boundaries
On watchCanyons of the Ancients National MonumentOil and gas drilling near archaeological sites
On watchDinosaur National MonumentOne Big Beautiful Bill expands mandatory leasingYour move
Their own site; they take gifts directly. Your dollar never passes through us.
Their site ↗SpeakComment and callOpen comment windows and call scripts for fights like this one, ready to send.
Public Lands Action NetworkFollowWatch the mapEvery threatened place in the country, tracked, with who stands for each.
Threatened Lands Map10 groups on the record, 2 more likely to care, Rocky Mountain Wild with 8 staff + 100 volunteers. That is who is holding it. Find your way in.