https://www.nps.gov/yose/planyourvisit/wildcond.htm
It starts with this summary:
But then, if you keep reading the report about trails in specific areas, it is clear that many trails even at 9,000 feet in forested areas still have a lot of snow.Summer backpacking is in full swing with snow melting fast. With the warmer temperatures, snow in the high country is turning to water, making for a very wet backcountry. Backpackers are urged to exercise extreme caution around water and at creek crossings. The snow line is now hovering around 10,500 feet, but varys moreso on aspect and location as snow melts unevenly. Forested and north facing areas will hold snow later than exposed or south facing areas. At higher elevations and in alpine areas, snow will be sticking around for some time to come, so wayfinding skills with a map and compass and/or a GPS is a necessity.
Tioga Road is now open to all traffic. Please note, there are no services and no potable water in Tuolumne Meadows, only portable toilets. Trailheads along the road are open and many trails are accessible. White Wolf, Yosemite Creek Campground, the May Lake Road, and the Tuolumne Campground remain closed. With lingering snow in north-facing, forested areas and at high elevations, hikers should be prepared for routefinding. Navigation skills are critical for hikers traveling into the high country. The Tuolumne Meadows backpacker campground is closed until the campground opens (at a date not yet anticipated). When backpacking in areas off of Tioga Road, please note that some popular camping areas are still wet and muddy. Proper campsite selection and waste burial is crucial in early-season conditions. A reminder that backpackers are not to build new fire rings out in Yosemite's wilderness and to be mindful of the plants and meadowlands. A second reminder to take the time to bury human waste in bare soil and not in snow.
Water levels for most rivers and creeks have peaked but are still running high for this time of year but generally below flood levels. Backpackers not used to higher flows should use precautions. Backpackers are urged to exercise extreme caution around water and at creek crossings. Be knowledgeable and practice save creek crossing techniques. If you do not feel comfortable crossing a creek, turn around.
-Phil