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Below you will find LRW locations including the
Administration Building and each of our facilities. Select
"Map" if you would like to connect to MapPoint for driving
directions to a particular location.
Clearwater Administration Building
11 Clearwater Drive
Little Rock, AR 72204
(501) 376-2903
Click here for a map
Adams Field Treatment Plant
1001 Temple Street
Little Rock, AR 72202
(501) 688-1525
Click here for a map
Clearwater Maintenance Facility
5300 South Shackleford Road
Little Rock, AR 72204
(501) 223-1500
Click here for a map
Fourche Creek Treatment Plant
9500 Birdwood Drive
Little Rock, AR 72206
(501) 490-5400
Click here for a map
Peak Flow Attenuation Facility
5200 Scott Hamilton Drive
Little Rock, AR 72209
Click here for a map
Little Maumelle Treatment Plant
(501) 688-1582
24924 Chenal Parkway
Little Rock, AR 72227
Click here for a map
The Adams Field Wastewater Treatment Plant has been in operation since 1961 and was Little Rock's first wastewater treatment plant. From 1961 until 1972, the plant was equipped with only primary treatment. Secondary treatment facilities were added in 1972 and the plant is now rated as a 36 million gallons per day complete-mix activated sludge plant, serving approximately 70% of the City of Little Rock.
The plant is a two-stage "secondary" treatment plant, designed to reduce the pollutant load by approximately 90%. A combination of physical and biological processes are utilized to reduce this pollutant load in wastewater. Wastewater from Little Rock enters the plant via three 60-inch diameter gravity sewer lines at an average depth of 30 feet below ground and requires the pumping or lifting of the sewage to the surface.
Wastewater is then sampled, flow measured, and is then screened to remove large particles. The flow then passes through three parallel primary clarifiers where solid materials settle to the bottom or float to the top to be skimmed off. Solids and floatables are then sent to a Preliminary building where grit, gravel, and scum are removed. Each circular clarifier is 11 feet deep and 115 feet in diameter. Wastewater is held in these basins for about two hours.
Following primary treatment, the flow enters the activated sludge secondary process. Each of the six rectangular activated sludge aeration tanks are 15 feet deep, 40 feet wide, and 160 feet long. A biological microorganism population, which utilizes the incoming dissolved organic material in the wastewater as food, is maintained in the tanks.
Following the aeration tanks, the wastewater passes through a final clarifier section to capture the biological organisms that settle in the final clarifiers. These biological organisms that settle are returned to the activated sludge aeration tanks. These circular clarifiers are 15 feet deep and 145 feet in diameter. The overflow then passes to the Disinfection Building where four channels of ultraviolet lights are utilized to sterilize the bacteria remaining after treatment.
Treated wastewater, which meets or exceeds all State and Federal requirements, is then piped to the Arkansas River through a six-foot diameter pipeline and discharged, causing no adverse effect on the river or public health. Solids captured during the treatment process are re-circulated in the aeration tanks to maintain a viable microorganism population, while some solids are wasted from the plant process daily via pumping through a five-mile, 12-inch force main to the Fourche Creek Treatment Plant for further processing.
The Clearwater Operations/Maintenance Complex sits on a
36.59-acre tract conveniently located at 5300 South
Shackleford Road, with easy access to Interstates 30, 430,
and 630. The building was constructed in 1989 to replace the
LRW's old Central and West End maintenance shops on
Arch Street and Asher Avenue.
LRW jointly owns the building with Central Arkansas
Water (formerly known as Little Rock Municipal Water Works)
and the LRW portion of construction cost about $2 million.
Additionally, the two utilities operate a Fleet Maintenance
Department at the Clearwater facility for the maintenance
and repair of vehicles and equipment.
About 100 LRW employees in the Division of Maintenance work
from the Clearwater facility, making it the home base for
the majority of LRW work force.
Arkansas' most innovative wastewater treatment facility, Fourche Creek is a secondary treatment plant with step-feed activated sludge process and an installed capacity of 16 million gallons of wastewater per day (which can serve the population equivalent of 120,000 persons).
A combination of physical and biological processes is utilized to reduce the pollutant load by approximately 90% at the plant. Wastewater from southwest Little Rock enters the plant via a pressure line from a pump station located in College Station. The biological treatment process is comprised of three sets of aeration basins and three sets of final clarifiers. Its aeration system has three fine bubble ceramic diffuser basins with diffused air supplied by four sets of blowers, each of which has the capability of 6,350 standard cubic feet of air.
The Fourche Creek Treatment Plant can control its loading by having the amount of flow that is diverted to it increase or decrease by accepting 5 million gallons or less of flow diverted from Adams Field as desired.
The sludge from both Adams Field and Fourche Creek is thickened, digested and stored at the Fourche Creek plant. This digested sludge produces methane gas that is utilized in the engine/generator building to produce electricity, which operates the plant.
LRW is required to reduce sanitary sewer overflows in Little Rock because of the settlement agreement between the utility and the Sierra Club. The Peak Flow Attenuation Facility project is designed to handle a storm where five inches of rain would fall within 48 hours, which is also referred to as a ‘peak flow event.’ The purpose of this project is to improve the hydraulic capacity of the collection system during heavy rain and address wet weather sanitary sewer overflows in the western end of the Fourche Bottoms.
At a cost of nearly $33 million, the project consisted of constructing a 50 MGD pump station near Mabelvale Pike, 11,500 linear feet of force main pipe, two diversion structures and a 30 million gallon storage facility (a 10 million gallon and a 20 million gallon concrete structure). The detention basins store water generated by rain fall and then discharge into the collection system when flows return to normal. The Arch Street Pump Station rehabilitation and hydraulic upgrade project was also constructed simultaneously with the Peak Flow Attenuation Facility project. These projects complement each other in that they both enhance the hydraulic conveyance capacity of the sanitary sewer system through the Fourche Creek Bottoms, thereby reducing sanitary sewer overflows during wet weather events.
LRW engineers estimate that the Peak Flow Attenuation Facility will only be utilized 10 to 15 times annually.
The Little Maumelle Treatment Facility is capable of handling
4 million gallons of waste daily. This new plant features up-to-date technology, which includes a tertiary treatment process, aesthetic design, reduced size, and odor and noise control. Similar to the Fourche Creek Treatment Plant, the step feed process is utilized at this new facility as well. By combining the latest technology along with a proven, successful process, the Little Maumelle Treatment Plant will fulfill the current and future needs of the community.
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STONE WARD