Timberline Golf Course in Peosta, Iowa, was designed by Mike Hall and sits in the rolling terrain of eastern Iowa's Dubuque County region. The course occupies land that transitions between wooded areas and open farmland, characteristic of the Driftless Area that extends into this part of the state. This topography, which escaped glaciation, provides natural elevation changes and wooded corridors that shape the routing and playing experience. The design incorporates the property's mature tree lines and natural contours into a layout that asks golfers to navigate both elevation and strategic angles. Holes move through varying landscapes, with some playing along ridgelines and others descending into lower-lying areas. The wooded sections frame fairways and create definition, while the more open stretches allow wind to become a factor in club selection and shot shaping. Timberline serves the Dubuque metropolitan area and surrounding communities in northeast Iowa and southwest Wisconsin. The course is part of the region's public golf infrastructure, providing access to a layout that uses the land's natural features rather than extensive earthmoving. The facility operates as a daily-fee course, drawing local golfers and visitors exploring the Driftless Area's recreational offerings. The setting reflects the agricultural and forested character common to this part of the Upper Mississippi River valley.