Oregon Bureau of Land Management (BLM) Invasive Plant Environmental Assessments

Bureau of Land Management districts in Oregon are preparing environmental assessments (EAs) to analyze the potential effects of updating their existing noxious weed management programs by shifting the programs' herbicide use to generally newer, more target-specific and environmentally friendly herbicides, and allowing those herbicides to be used on non-native invasive plants, not just noxious weeds.

Denton and Denton are serving as Team Lead on these EAs, which tier to:

• the 2010 Vegetation Treatments Using Herbicides on BLM Lands in Oregon Environmental Impact Statement and Record of Decision
• the 2007 Vegetation Treatments Using Herbicides on 17 Western States Programmatic Environmental Impact Statement and Record of Decision.
• the 2016 Vegetation Treatments Using Aminopyralid, Fluroxypyr, and Rimsulfuron on Bureau of Land Management Lands in 17 Western States Programmatic Environmental Impact Statement and Record of Decision.

Status:

• Lakeview Resource Area (signed July 2015)
• Burns District (signed July 2015)
• Prineville District (signed May 2016)
• Vale District (signed December 2016)
• Medford District (signed February 2018)
• Coos Bay District (signed October 2018)
• Northwest Oregon District (signed December 2019)
• Roseburg District (expected to be signed May 2022)

Other BLM invasive plant NEPA (not done by Denton and Denton)

• Klamath Falls Resource Area (signed in April 2019)

Current Herbicide Risk Assessments (links below table)

Active Ingredient	Forest Service	BLM Human Health	BLM Ecological
2,4-D	✓	BLM 2016	BLM 2016 *
Aminopyralid	✓	BLM 2016	BLM 2016
Bromacil		BLM 1991	BLM 2007
Chlorsulfuron	✓		BLM 2007
Clopyralid	✓	BLM 2016	BLM 2016 *
Dicamba	✓
Dicamba + diflufenzopyr			BLM 2007
Diflufenzopyr		BLM 2007
Diuron		BLM 1991	BLM 2007
Fluazifop-p-butyl	✓
Fluridone	✓	BLM 2007	BLM 2007
Fluroxypyr	✓	BLM 2016	BLM 2016
Glyphosate	✓
Hexazinone	✓
Imazapic	✓	BLM 2007	BLM 2007
Imazapyr	✓
Metsulfuron methyl	✓
Picloram	✓
Rimsulfuron		BLM 2016	BLM 2016
Sethoxydim	✓
Sulfometuron methyl	✓	BLM 2007	BLM 2007
Tebuthiuron	✓	BLM 1991	BLM 2007
Triclopyr	✓

Forest Service risk assessments cover both human health and ecological receptors.

BLM human health and ecological risk assessments are separate:

• 2007 BLM Risk Assessments (see sections I to U)
• 2016 BLM Risk Assessments (see sections 7 to 9)
  
  [* Ecological Risk Assessments for 2,4-D and Clopyralid ]
• 1991 BLM Risk Assessments (Appendix E, page 38)