Road Closures Due to El Portal Fire
The Big Oak Flat Road between Crane Flat and the El Portal Road is temporarily closed. There is no access to Yosemite Valley via the Big Oak Flat Road or Highway 120. Tioga Road is open and accessible via Big Oak Flat and Tioga Pass Entrances. More »
Campground Closures Due to Fire
Crane Flat, Bridalveil Creek, and Yosemite Creek Campgrounds are temporarily closed. More »
Yosemite National Park is Open
Yosemite Valley, Glacier Point, and Wawona/Mariposa Grove areas are open and accessible via Highways 140 and 41. Tioga Road is not accessible via Highways 140 and 41 due to a fire.
Meadows perform a variety of functions from flood control to groundwater recharge and also provide incomparable wildlife and plant habitat. Different meadows may provide some or all of these functions depending on the type of meadow:
Water Quality (Pollution control): Meadows can improve water quality because of their ability to trap sediments. As the velocity of incoming waters is slowed, sediments are deposited. These sediments may contain physically or chemically attached toxicants (heavy metals, pesticides, and toxic organic substances). These toxicants may be "removed" by chemical breakdown, decomposition by soil microbes, or assimilation into plant tissues. Retention of nutrients occurs, too, within sediments and plant tissue—the transformation of inorganic nutrients to organic form, and the transformation of nitrogen to gaseous form. Nitrogen and phosphorous, generally the nutrients in greatest abundance, are taken up and stored by wetland vegetation. This function improves downstream water quality by filtering out potential pollutants.
Groundwater Recharge: Groundwater recharge is the movement of surface water to groundwater by percolation to the underlying water table. Meadows can either serve as groundwater recharge areas (where water percolates down) or discharge areas (where groundwater percolates up) depending on the type of meadow. Three parameters that influence the movement of groundwater to and from a wetland: the elevation of the wetland relative to the groundwater; the mass and pressure of water; and the physical characteristics of the underlying soils and bedrock.
Did You Know?
Hiking to Half Dome? Permits are now required seven days per week when the cables are up (typically late May through mid October, conditions permitting). More...