Editing Sacramento River (section)

===Sacramento Valley===
Below Shasta Dam the Sacramento River enters the [[foothills]] region of the northern Sacramento Valley. It flows through [[Keswick Dam]], where it receives about {{convert|1200000|acre.ft|e6km3|abbr=unit}} of water per year diverted from the [[Trinity River (California)|Trinity River]]. It then swings east through [[Redding, California|Redding]], the largest city of the [[Shasta Cascade]] region, and turns southeast, entering [[Tehama County, California|Tehama County]]. East of [[Cottonwood, California|Cottonwood]] it receives [[Cottonwood Creek (Sacramento River)|Cottonwood Creek]] – the largest undammed tributary – from the west, then [[Battle Creek (California)|Battle Creek]] a short distance downstream. Below Battle Creek it carves its last gorge, Iron Canyon, emerging from the hills at [[Red Bluff, California|Red Bluff]], where a pumping station (which replaced the [[Red Bluff Diversion Dam]]) removes water for irrigation. Beyond Red Bluff the river reaches the low [[floodplain]] of the Sacramento Valley, receiving [[Mill Creek (Tehama County)|Mill Creek]] from the east and [[Thomes Creek]] from the west near [[Los Molinos, California|Los Molinos]], then [[Deer Creek (Tehama County, California)|Deer Creek]] from the east near [[Vina, California|Vina]].<ref name="ACMEmapper"/>

[[Image:US-CA-Sacramento-SacramentoRiver-WaterTreatmentInlet-2012-04-18T13-46-13.jpg|thumb|right|Sacramento River above Sacramento]]
Southeast of [[Corning, California|Corning]], the Sacramento forms the boundary of Tehama County to the west and [[Butte County, California|Butte County]] to the east. A few miles downstream it forms the border of Butte County and [[Glenn County, California|Glenn County]] to the west. [[Stony Creek (Sacramento River)|Stony Creek]] joins from the west in Glenn County, near [[Hamilton City, California|Hamilton City]] and about {{convert|15|mi|km}} west of [[Chico, California|Chico]]. The river then forms the Glenn–[[Colusa County, California|Colusa County]] line for a short distance before crossing entirely into Colusa County. It passes by the [[Sutter Buttes]], a group of volcanic hills that rise abruptly from the middle of the Sacramento Valley, where it receives [[Butte Creek (Butte County, California)|Butte Creek]] from the east at [[Colusa, California|Colusa]]. Below Colusa the river flows south-southeast, forming the border of Colusa County and [[Sutter County, California|Sutter County]] to the east.<ref name="ACMEmapper"/>

About {{convert|20|mi|km}} further downstream, the Sacramento River reaches the Tisdale Weir. During floods, water overtops the weir and flows east into the [[Sutter Bypass]], the first of two major bypass channels that temporarily store and move floodwaters downstream to reduce pressure on the main channel of the Sacramento. The Sacramento River and the Sutter Bypass flow parallel for over {{convert|40|mi|km}}, rejoining on the border of Sutter County and [[Yolo County, California|Yolo County]] near [[Knights Landing, California|Knights Landing]]. The [[Feather River]], the largest tributary of the Sacramento, joins from the east at [[Verona, California|Verona]] directly below the Sutter Bypass. A second flood control structure, the Fremont Weir, diverts flood waters from both the Sacramento and Feather Rivers into the [[Yolo Bypass]], which parallels the Sacramento River down the west side of the valley. [[Cache Creek (Sacramento River)|Cache Creek]] and [[Putah Creek]], two major tributaries which formerly joined the Sacramento River from the west, are now intercepted by the Yolo Bypass via man-made channels.<ref name="ACMEmapper"/> The main channel of the Sacramento flows south, forming the Yolo–[[Sacramento County, California|Sacramento County]] line.