BLM plans safety and access improvements at San Pedro House Work scheduled to begin Jan. 11 SIERRA VISTA, Ariz. – The Bureau of Land Management’s Tucson Field Office will construct a permanent fence near the San Pedro House located in the BLM-administered San Pedro Riparian National Conservation Area near Sierra Vista along Highway 90. The work will occur where a temporary fence was previously installed to protect the visiting public from falling branch hazards from a large Cottonwood tree. Some of the trails in the nearby Demonstration Garden will be surfaced with crushed stone to improve accessibility. The work is planned from Jan. 11–Feb. 11.