(This measure has not been amended since it was introduced. The summary has been expanded because action occurred on the measure.) Red River Gradient Boundary Survey Act (Sec. 3) This bill directs the Bureau of Land Management (BLM) to commission a survey to identify the South Bank boundary line with respect to land along a specified 116-mile stretch of the Red River in Oklahoma and Texas (the affected area). The survey shall: adhere to the gradient boundary survey method; span the length of the affected area; be conducted by surveyors who are licensed and qualified to conduct official gradient boundary surveys, and selected by and operating under the direction of the Texas General Land Office and the Oklahoma Commissioners of the Land Office (the offices); and be completed within two years of enactment of this bill. The BLM shall submit the survey to the offices for approval. The offices shall determine whether to approve the survey within 60 days after receiving it. Surveys of individual parcels in the affected area shall be conducted according to the requirements for the survey of the South Bank boundary line. A parcel survey also shall be approved or disapproved by the offices within 60 days of receipt. Neither the South Bank boundary survey nor any parcel survey shall be submitted to the BLM for approval. After a survey for an individual parcel has been approved, the offices shall submit to the BLM: a notice of the approval of such survey; and a copy of such survey and any field notes related to the parcel. After receiving a notice of the approval of a survey related to an individual parcel, the BLM shall provide to each landowner of land adjacent to that parcel: such notice; and a copy of such survey and any field notes related to the parcel.