-
San Dimas Experimental Forest Closure
The San Dimas Experimental Forest, located north of Glendora, is currently closed to public recreation activities. The reason for this closure is that the Experimental Forest's primary purpose is research. Many long-term climate, soil, air pollution, erosion, vegetation, wildlife, and fire studies are conducted here, with research installations scattered throughout the Experimental Forest. Research instruments need uninterrupted data gathering from established locations and any disturbance (however subtle) of experimental areas would be harmful.
Alert Start Date: March 23, 2026
Alert End Date: N/A
Order Number: na
Contact Information
Contact Name: Angeles National Forest Supervisor’s Office
Contact Number: (626) 574-1613
Associated Documents
Forest Order
OCCUPANCY AND USE SPECIAL CLOSURE
SAN DIMAS EXPERIMENTAL FOREST
Pursuant to Title 36 of the Code of Federal Regulations, Section 261.50(a) and (b), the following acts
are prohibited on the area, roads and trails within the San Dimas Experimental Forest (as depicted on the
attached Exhibit A) until further notice.
1. Entering or being in the area. 36 CFR 261.53(d)
2. Pursuant to 36 CFR 251,50(e), the following persons are exempt from this order:
a. Persons with a permit specifically authorizing the prohibited act.
b. Any Federal, State, or local officer, or member of an organized rescue or firefighting force in the performance of an official duty.
Executed at Portland, Oregon, this 23rd day of March 2026
Frank H. McCormick, Ph.D.
Acting Station Director
Pacific Southwest Research Station
Pacific Northwest Research Station
USDA Forest Service
Pursuant to 16 U.S.C. 551, violation of this prohibition is punishable by a fine not to exceed $5000.00
or imprisonment not to exceed six months or both.