C-36 Lower South Mayde Creek

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PROJECT UPDATE - 2/09/2022

On February 9, 2021, a PER was presented to and approved by Harris County Commissioners Court. It includes an alternative for a bypass channel to increase the discharge of stormwater into Addicks Reservoir. Following approval of the PER, the Flood Control District must secure partnership funding prior to proceeding with design and phased construction of the bypass channel.

Recent Actions

January 4, 2022 - Harris County Commissioners Court authorized the acquisition of four tracts of land in support of this project.

February 9, 2021 - Harris County Commissioners accepted the Preliminary Engineering Report and authorized the Flood Control District to proceed with design and construction of this project.

January 28, 2020 - Harris County Commissioners Court approved an additional $172,420 for engineering services in support of this project

October 9, 2018 – Harris County Commissioners Court authorized the County Judge to execute an agreement with the U.S. Army Corps of Engineers to allow the Flood Control District access to Addicks Reservoir property in support of this project

March 27, 2018 - Harris County Commissioners Court approved a $495,000 agreement for engineering services in support of this project.

PROJECT DESCRIPTION

The Harris County Flood Control District has begun preliminary engineering on a project to improve the flow of stormwater and reduce flooding risks along lower South Mayde Creek, a tributary in the Addicks Reservoir watershed of northwest Harris County.

A Preliminary Engineering Report (PER) will recommend details for channel improvements between Fry and Greenhouse roads, and will explore the possibility of a bypass channel to increase the discharge of stormwater into Addicks Reservoir. Preliminary engineering activities include collecting survey, geotechnical, and environmental field data, as well as coordinating with the U.S. Army Corps of Engineers, which owns, operates, and maintains the reservoir.

Preliminary Engineering Report Public Meeting - 03/21/18

Click this link to open the Report (PDF)

On February 9, 2021, a PER was presented to and approved by Harris County Commissioners Court. It includes an alternative for a bypass channel to increase the discharge of stormwater into Addicks Reservoir. Following approval of the PER, the Flood Control District must secure partnership funding prior to proceeding with design and phased construction of the bypass channel.

The creek, which flows into the Addicks Reservoir near Greenhouse Road, has a history of flooding in this area, with structures inundated during Hurricane Ike in 2008, a storm in April 2009, the Tax Day Flood of 2016, and Hurricane Harvey in 2017. The creek currently has a level of service that ranges from less than the 50 percent (2-year) storm near the Addicks Reservoir to between the 1 percent (100-year) and .4 percent (250-year) storm in the Morton Ranch area.

Public Meeting (March 21, 2018)

The PER is the next step following a feasibility study completed in 2017, which explored various ways to reduce the frequency of riverine flooding events along South Mayde Creek, as well as their depth and duration. The goal of the feasibility study was to achieve a level of protection equal to a storm that has a 1 percent chance of occurring each year (the “100-year flood”). The feasibility study recommended stormwater conveyance improvements for South Mayde Creek downstream of the Grand Parkway (State Highway 99) to Greenhouse Road, and construction of a bypass channel east of Greenhouse Road on the Addicks Reservoir. The feasibility study also considered the potential for future stormwater detention and retention, as well as property buyouts.