WSP12880

• File Number: 8449.927
• Description: Northeast Cooperative Water Supply Investigation
• State: CO
• Basin: South Platte
• Date: 6/13/1998
• Author: Hydrosphere Resource Consultants
• Title: Data Packages developed under Tasks 2 and 3 of Northeast Cooperative Water Supply Investigation
• Water Supply Pro - Doc Type: Data

6

NE Quadrant Provider Profile

Provider: City of Thornton
Service Area: City of Thornton plus minor enclaves outside of City boundaries

Existing Demand: The current population is 78,000 with a raw water demand of
approximately 19,000 AF/yr.

Future Demand: Ultimate development, as currently projected, will require a supply of
93,000 AF/yr. by the year 2056.

Storage Facilities:
Name
Stanley Lake
Spinney Reservoir
East Gravel Lakes (Tani, Dahlia)
West Gravel Lakes (Brannan)
Barr, Wellington,Duck

Capacity (AF)
13,000
4,000 (1999)
8,750
3,325
1,000

Existing Water Sources(average yield):

Upper Clear Creek
Lower Clear Creek! S. Platte
South Park
Northern Supply
Exchange Rights

12,000
9,500
9,000
24,000 - 48,000
10,000 - 20,000

Water Treatment Capacities:
Columbine TP 30 (MGD)
Thornton TP 20 (MGD)

Groundwater Usage:
32 tributary wells with a combined capacity of about 8,000 AF per year. These well have
very junior priorities and Thornton augments these wells with a variety of augmentation
supplies. Thornton also own 6 nontributary wells, which have not been used recently
due to relatively low yield and high costs.

Reusable Water Supplies: Thornton currently uses approximately 50% of its reusable
return flows for exchanges, augmentation, and irrigation uses. Thornton plans to increase
its use of reusable water for exchanges and augmentation purposes. In the near future
Thornton plans to acquire several storage pits downstream of the Burlington Headgate to
be used as a substitute supply for water obtained from its Northern Project.