老干江,是松花江的一条支流。她从奔流北下的松花江分流东去,流经榆树西部境内的大坡等三个乡(镇)七八个自然村屯之后,再从秀水、大于两乡之间的两江口回流入松花江主江道。由于老干江的水情受松花江的左右,主江水位上涨她也涨,主江水位下降她也降。这就给这条老干江造成了一种 Laoshengjiang, is a tributary of the Songhua River. After diverting eastward from the Songhua River flowing northward through seven or eight villages in three townships (towns) such as Dapo in the west of the elm tree, she returned to the Songhua River from Xiushui and Liangjiang Estuary between the two townships Main River Road. As the water of the Lao Gan River is controlled by the Songhua River, she also rises in the water level of the main river, and she also drops as the water level of the main river drops. This has created a kind of Lao Gan Jiang