Current trends in New Mexico are not being extensively monitored. Data are lacking on current population levels and trends in Texas. Loss and modification of habitat may have reduced populations on the Rio Grande and Pecos Rivers. The north-central limit of breeding southwestern willow flycatchers is in southern Utah. Southern Utah is characterized by extreme topographic relief.
Few data are available on population trends in southern Utah.
However, loss and modification of habitat is likely to have reduced populations on the Virgin, Colorado, and San Juan Rivers. However, no recent data are available on population levels or trends. Habitat may remain along the lower Virgin River and at the inflow of the Virgin River into Lake Mead. However, loss and modification of habitat is likely to have reduced populations on the Virgin and Colorado Rivers. Colorado Whether or not the southwestern willow flycatcher breeds in Colorado is unclear.