 Much of the ecology of the watershed has been affected by wildfires and forestry , and is considered to be in a seral phase . The river travels through several different vegetation zones . In its upper reaches , the Adams flows through the Interior Cedar Hemlock zone . These forests are similar to the coastal forests of British Columbia and contain old @-@ growth trees up to 1000 years in age . Old @-@ growth stands along the river also contain rare species of lichen , likely isolated by the last Ice Age . The floodplain of the Upper Adams contains wetland species of deciduous trees such as black cottonwood as well as a dense layer of shrubs including black twinberry , red @-@ osier dogwood , and thimbleberry . The lower river is dominated by the drier Interior Douglas Fir vegetation zone . Other conifer species present are Ponderosa pine , Engelmann spruce , and alpine fir . The area around the river mouth has been altered by human activities such as farming and livestock grazing . 
 Much of the ecology of the watershed <a href='been_done' title='1'><mark>has</mark></a> been affected by wildfires and forestry , and is considered to be in a seral phase . The river <a href='uninflect' title='2'><mark>travels</mark></a> through several different vegetation zones . In its upper reaches , the Adams <a href='uninflect' title='3'><mark>flows</mark></a> through the Interior Cedar Hemlock zone . These forests <a href='drop_aux' title='4'><mark>are</mark></a>similar to the coastal forests of British Columbia and contain old @-@ growth <a href='uninflect' title='5'><mark>trees</mark></a> up to 1000 years in age . Old @-@ growth <a href='uninflect' title='6'><mark>stands</mark></a> along the river also contain rare species of lichen , likely isolated by the last Ice Age . The floodplain of the Upper Adams <a href='uninflect' title='7'><mark>contains</mark></a> wetland species of deciduous trees such as black cottonwood as well as a dense layer of shrubs including black twinberry , red @-@ osier dogwood , and thimbleberry . The lower river is dominated by the drier Interior Douglas Fir vegetation zone . Other conifer species present <a href='drop_aux' title='8'><mark>are</mark></a>Ponderosa pine , Engelmann spruce , and alpine fir . The area around the river mouth <a href='been_done' title='9'><mark>has</mark></a> been altered by human activities such as farming and livestock grazing . 
Much of the ecology of the watershed done been affected by wildfires and forestry , and is considered to be in a seral phase . da river travel through several different vegetation zones . In its upper reaches , the Adams flow through the Interior Cedar Hemlock zone . These forests similar to the coastal forests of British Columbia and contain old @-@ growth tree up to 1000 years in age . Old @-@ growth stand along the river also contain rare species of lichen , likely isolated by the last Ice Age . The floodplain of the Upper Adams contain wetland species of deciduous trees such as black cottonwood as well as a dense layer of shrubs including black twinberry , red @-@ osier dogwood , and thimbleberry . Tdalower river is dominated by the drier Interior Douglas Fir vegetation zone . Other conifer species present Ponderosa pine , Engelmann spruce , and alpine fir . Thdarea around thedaver mouth done been altered by human activities such as farming and livestock grazing .