2021 Map of Irish Hill

About this map

Irish Hill rises above the transition where the eastern edge of the Sacramento Valley meets the foothills of Amador County. This landscape is defined by its complex drainage network and historic water infrastructure, including the Arroyo Seco Ditch and numerous creeks like Willow Cr and Dry Cr. The settlement pattern centers on the established community of Plymouth in the northeast and the northern reaches of Ione in the south, connected by a web of rural routes such as the Old Plymouth-Sacto Finn Ranch Rd. Topographical features such as Bisbee Peak, Sugarloaf Peak, and Rocky Point provide prominent landmarks across the terrain. Local history is reflected in names like Spanish Gulch and New York Gulch, hinting at the area's gold-era heritage and the subsequent development of water storage at Henderson Reservoir and Goffinet Reservoir.