Idaho · Area of Critical Environmental Concern
Nine Mile Knoll
BLM found a wildlife resource here, and its plan calls for special management. BLM's records place 10 rights of way inside the line today, and eight grazing allotments cover part of it. It covers 41,641 acres and was designated November 29, 1985, in the Medicine Lodge RMP 1985. In the plan's name, RMP stands for resource management plan.
One of the 1,120 places the Bureau of Land Management has designated an Area of Critical Environmental Concern. This page shows its line, what BLM found there and what sits inside it.
The line
The rights of way
10 rights of way sit inside the line. BLM files 9 under non-energy facilities and 1 under other energy facilities.
- FREMONT COUNTY (Idaho)2rights of way
- EGIN BENCH CANALS INC2rights of way
- JEFFERSON COUNTY (Idaho)2rights of way
- IDAHO WATER RESOURCE BOARD1right of way
- PACIFICORP1right of way
- MADISON COUNTY (Idaho)1right of way
- USBR (COLUMBIA-PACIFIC NORTHWEST REGIONAL OFFICE)1right of way
Grazing allotments
8 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Junipers41,450acres
- Nine Mile Knoll13,424acres
- Grassy Ridge9,437acres
- West Ridge4,155acres
- Plano4,015acres
- Egin Lakes2,522acres
- Bitterbrush1,668acres
- Quayles212acres
The nearest areas
- St. Anthony Sand Dunes RNAIdaho · 1,824 acres · a grazing allotment covering part of it1miles
- North Menan ButteIdaho · 781 acres · 3 rights of way13miles
- North Menan Butte RNAIdaho · 344 acres · 2 rights of way14miles
- Reid Canal Island RNAIdaho · 29 acres · nothing placed inside21miles
- Snake RiverIdaho · 144,078 acres · at least 1 active mining claim and 4 more BLM lists as Filed, 89 rights of way, 61 grazing allotments covering part of it25miles
Next to it
St. Anthony Sand Dunes Research Natural Area of Critical Environmental Concern touches the line.
More from BLM's Idaho office
Every area BLM's Idaho office holdsThe proposed rule
A proposed rule, RIN 1004-AF53, would change how BLM drafts every land use plan, and how it designates ACECs like Nine Mile Knoll. The comment window hasn't opened: the proposed rule wasn't in the Federal Register at our last check. The Watch sends one email the day it prints.
The rule's abstract
The purpose of this rulemaking is to establish in regulations an updated process for the approval of the development, revision, amendment, and maintenance of land use plans, as provided for by the Federal Land Policy and Management Act of 1976, for public lands administered by the Bureau of Land Management (BLM). Additionally, this rulemaking will provide clarification of the process the BLM uses for designating Areas of Critical Environmental Concern.Unified Agenda entry for RIN 1004-AF53, Publication ID 2026, reginfo.gov (OMB OIRA), read Oct 18, 2026