Here's a list of some digital guides.
STATEWIDE TRAIL SITES
• Salt Lake Tribune Hike of the Week database, http://local.sltrib.com/hiking. The newspaper has been collecting hikes here since 2005. The database has more than 200 trails across the state.
• Utahtrails.com, www.utahtrails.com. Author David Day, basically, exported his collection of Utah hiking books onto this website.
• Girl on a Hike, www.girlonahike.com. Alicia Baker takes readers hiking, with an emphasis on trails where you can take a dog.
• Utah Trail Data, https://gis.utah.gov/data/recreation/trails. The state of Utah used GIS data to make a statewide trail map or post files that allow you to download the data and make your own maps.
REGIONAL TRAIL SITES
• Logan Canyon Hiking Trails, www.logancanyonhiking.com. The website features a detailed collection of hikes in one of Utah's best-known canyons.
• Cache Hikers, www.cachehikers.org. The website lists trails across Cache County. It's updated regularly with trip reports and a calendar of group hikes.
• Weber Pathways, www.weberpathways.org. This site lists trails for hikers, mountain bikers, horseback riders and even cross-country skiers in Ogden and across Weber County. The Weber Pathways volunteers even publish newsletters and event information on the site.
• Davis County Trails, www.daviscountyutah.gov/trails. The county government manages this site. It uses Google Maps and GIS data and provides details about a slew of hikes in Davis County.
• Tooele County Trails, www.tooelecountytrails.com. An illustrative map helps hikers, mountain bikers and equestrians find a trail.
• Wasatch Hiker, www.wasatchhiker.com. Trails traversing the Wasatch Mountains in Salt Lake and Utah counties are listed in order of location. The site lists hikes in Mill Creek, Big and Little Cottonwood, American Fork and Provo canyons and the Nebo Loop, among other locations.
• Mountain Trails Foundation, www.mountaintrails.org. This website lists Park City's hiking and biking trails and explains their conditions in the summer and the winter.
• South Summit Trails Foundation, www.southsummittrails.org. Hikers, mountain bikers and horse riders in the southern half of Summit County can find information on the trail systems there.
• Corner Canyon Trails Foundation, www.cornercanyontrails.com. The site caters to mountain bikers in Draper and the southeast corner of Salt Lake County, but the information is thorough enough that hikers can find a good trail, too.
• Manti-La Sal National Forest, www.fs.usda.gov/activity/mantilasal/recreation/hiking. Among the federal websites, this is one providing digital maps and good descriptions of the trails. This national forest covers a huge swath from central Utah to the southeast corner of the state.
• Moab Area Hiking Trails, www.discovermoab.com/hiking.htm. This is a travel council website with a hiking page, but the page has solid information about a variety of hikes around Moab.
• Trails Kanab, www.trailskanab.com. Equestrians and hikers get equal treatment on this site filled with trails in and around Kanab.
• Santa Clara Trails, www.santaclaratrails.com. Not many people explore the north and west side of Washington County, but this website will make you consider doing so.
• Hike St. George, hikestgeorge.com. The name is a little misleading — in a good way. The website has detailed information about trails in St. George and across Washington County.