SDIC Projects

CAPITAL PROJECTS FOR SDIC


	COMPLETED:
	Arata Creek Railroad Culvert. The District coordinate with the Port of Portland and the Railroad to remove two culverts under the railroad spur leading to the old Alcoa Aluminum Plant, the culverts were 3 feet too high creating flooding conditions upstream of the culverts. The banks were re-established to match the upstream and downstream conditions, at a project cost of $10,00.00

	Arata Creek Culvert Crossing Marine Dr. In 2006, in a joint project between the City of Troutdale which provided the funds, and the Multnomah County which provided the engineering and contract management, and the SDIC which provided the permits and benched the upstream portion of the creek, and additional Arata Creek culvert was put under Marine Drive. This has kept businesses to the South of Marine Drive from flooding during high water events by increasing the flood storage capacity along Arata Creek and increasing the flow capacity through the culverts. Cost of project was about $145,000.

	ON GOING PROJECTS:
	Levee Resurfacing - The levee west of Sundail Road is being resurfaced with soil that is available from development in the area. The levee is built of sand with an overlay of soil into which grass is seeded. Over the years the soil overlay has been eroded by some vehicle traffic, but mostly by the winds that blow down from the gorge from the east. The first section is stripped of vegetation and soil overlay put into place will be hydro-seeded. As soil is available, the project will continue heading west to the Sandy Pump Station.

	FEDEX Site - The FEDEX location, east of Sundail Road where the Alcoa Aluminum Plant used to sit, has been completed and the SDIC is working with the Port of Portland to design and enhance the waterways necessary to adequately drain the near 107 acres of impervious area associated with the project.

	Multnomah County Intergovernmental Agreement - For many years SDIC has maintained county-owned culverts that go under County Roads within SDIC. It was not an issue with SDIC, but the County has suggested that there needs to be an IGA to that effect to avoid any liability issues between the two agencies. Plans are underway to take of this.

	FUTURE PROJECTS:
	Salmon Creek Diversion - Salmon Creek is currently diverted at high water at NE Marine Dr. into wetlands owned by the Port of Portland. The diversion was put in as a temporary structure in 1996 to take the load from the Sandy Pump Station. The District is coordinating with the Port of Portland and the City of Troutdale to design and relocate the weir to facilitate flood control and wetland management, project cost $150,000.

	Levee Seepage Investigation - During a high river levee and the levees become saturated the District will use some form of infrared or ground penetration radar to detect areas in the levee that are abnormally saturated at the base or identified potential conduits for high level seepage of boils.

	Investigate Levee Toe Drains - Majority of the levee systems have a toe drainage system which drains the water away from the levee during high river levels so the levee does not become overly saturated at the base of the levee. Overtime the toe drainage system may become plugged or damaged. The investigation will identify any deficiencies that need to be corrected.

	Trash Raking Systems for Secondary Pump Stations - As water quality improve in our ditch system the aquatic weed becomes an increasing issue with plugging the intakes to the pump stations. In order to prevent the pumps from cycling continuously because of the weed build up the District has designed a trash raking system to remove the weed from the grate automatically. The trash raking system cost between $90,000 and $130,000 per pump station. As soon as the district can budget for the improvement the trash raking systems will be installed.

	Coordinated with Utilities to get a Secondary power grid to Pump Stations - The District is working with the electrical utilities to install a secondary power source from a secondary sub-station to all of our pump stations to establish a redundant and reliable power source to the pump stations.

	Replace 223rd Levee Control Structure - The control structure in the NE 223rd cross levee is deteriorating and needs to be reconstructed to provide a reliable closure system between MCDD and SDIC. No estimated cost at this time.

	Benching Arata and Salmon Creeks - The District is coordinating with the Port of Portland to reconfigure the Arata and Salmon Creeks for flood storage and the creation of emergent wetlands. The project is still in the conceptual phase.

	FEMA/LOMR for BFE - The Drainage District has contracted with West Consulting to develop a XPSWIMM hydaulic/hydrology model of the Drainage Districts stormwater conveyance and pumping system to determine a base floodplain elevation (BFE) that the District can protect development from flooding. The modeling has been completed and the BFE for the different drainage basin should be determined by early 2001. Once the BFE's have been determined the District will submit a Letter of Map Revision (LOMR) to FEMA for review and approval.