As an integral part of the Town of Castle Rock's vision of providing its residents with the highest quality services at the best value, the Stormwater Division manages stormwater runoff to minimize flooding hazards and to protect water quality in our watersheds. Services the Stormwater Division provides include: 

  • Storm sewer system development and maintenance
  • Watershed water quality protection 
  • Pollution prevention, detection and elimination
  • Construction site stormwater runoff control
  • Floodplain management


The Stormwater Division is funded through monthly services charges based on an urbanized footprint calculated for each account. New housing / commercial development is charged a development impact fee to account for downstream system improvements. This fee covers the cost of operation, upgrades, maintenance and improvements to the Town’s storm drainage facilities.

In accordance with Castle Rock Municipal Code, Chapter 13.30, Article 13.30.60, non-single family properties are entitled to appeal for an adjustment to the stormwater utility fee. To request a review of your stormwater monthly service charge, please complete the Request for Administrative Review form. Return form via email or mail it to us at:

Castle Rock Water
ATTN: Stormwater Division
175 Kellogg Court
Castle Rock, CO  80109.

Current projects

Currently, the Stormwater division has several projects underway, specifically for the stabilization of stream banks and the safety of our community. 

Hangman’s Gulch and E. Plum Creek improvements

Phase 3 of the improvements along Hangman’s Gulch from I-25 to East Plum Creek are scheduled from mid-February to June 2018. Improvements include the expansion of the outfall structure at the Union Pacific Railroad crossing and an upsize of the culvert crossing on the East Plum Creek trail. These improvements will help eliminate the flooding that can occur along the Trail.  Hangman’s Gulch trail will be closed during this entire period with no access or detours. East Plum Creek Trail at the confluence structure will be closed for approximately 2 weeks at the end of the project schedule. A soft surface detour will be provided.
Hangmans Gulch Channel Improvements Phase III

Wolfensberger Road Culverts at Omni Tributary

The existing corrugated metal pipe (CMP) culverts at this location, under Wolfensberger Road just west of Red Hawk Drive, are undersized and in poor condition. The Town will be replacing these pipes with a concrete box culvert to alleviate flooding risk for adjacent properties and travelers on Wolfensberger Road. 

Construction is scheduled for fall of 2017, with completion expected by early 2018.
View a map of this area. 

6400 South Tributary Drainage Improvements

Stormwater improvements are planned to stabilize the 6400 South Tributary drainageway, which flows through Town-owned open space north of Red Hawk Ridge Golf Course. The improvements include a grouted boulder drop structure, riprap, and grading within the drainageway channel. This work is funded by the Town of Castle Rock Stormwater Management Program. The work is necessary to protect the drainageway and underground utilities from erosion, and to preserve the natural resource.  

Construction is scheduled to begin the week of March 26, 2018,  with completion expected within approximately six weeks. However, due to Colorado’s unpredictable weather, exact start and end dates may vary. View a map of this area.

East Plum Creek South Well Field

Stormwater improvements to provide a predictable flow along East Plum Creek at Brookside Circle (across from Medved) have been completed. Improvements include grade control and bank stabilization, and are required to protect the Town's water supply system in this area.

Re-vegetation efforts to restore the area to a vibrant riparian habitat for wildlife and water quality are underway. Along with trees, shrubs and wetland plugs, soft surface trails will be placed. Completion is scheduled for spring of 2018.

East Plum Creek stormwater structure