Shelly Creek drains from the base of Little Mountain in Parksville, BC and flows northeast into the Englishman River, approximately 2 km from the Strait of Georgia. The confluence is located 200 m upstream of the Island Highway 19(A) Bridge. This stream channel is approximately 6.5 km long, draining a watershed area of approximately 5 km². All of the reaches of Shelly Creek have been negatively impacted by agriculture and urbanization.
Since 2011, MVIHES has helped to coordinate the monitoring of the outward migration of juvenile coho and other fish from Shelly Creek. This was done by installing a smolt trap ~200 m upstream from the confluence with the Englishman River. As many as 8094 coho smolt have overwinteredShelly Creek before migrating into the Englishman River, which shows the importance of the creek to coho salmon production.
As part of the Watershed Health and You program, Shelly Creek was subject to an instream fish habitat assessment in summer 2014. Volunteers were trained by Fisheries Biologist, Dave Clough, in the Urban Salmon Habitat Program (USHP) methodology. Shelly Creek was assessed in 1999 by MVIHES members using the USHP so this provided a great opportunity to replicate the study in 2014 and get new volunteers to assess this important tributary and determine the condition of the habitat after 15 years. The lower section (below Hwy 19) of Shelly Creek was studied in 2014.
The findings of the study were concerning and included a 50% decrease in pools, less cover for fish, significant increase in the amount of fine sediment covering the bottom of pools, less gravel for spawning, significant increase in erosion of stream banks, a high number of obstructions to fish passage during low flow periods, and man-made alterations to the creek.
A geomorphic overview was conducted by North West Hydraulics in Nanaimo who recommended approaches to habitat enhancement for the creek. Shelly Creek Restoration was completed in summer 2015 at the end of Blower Road.
This included armouring the creek banks downstream of the culvert with rock to prevent further erosion. Weirs were constructed using rock and geotextile cloth to create pools. The installation of gravel has created spawning habitat. A large settling pond was constructed upstream of the culvert to trap sediment and prevent it from covering the spawning gravel. And the creek bed was built up to the bottom of the culvert to allow fish passage. In March 2016, swordferns, cedar, salmonberry and red osier dogwood seedlings were planted along the creek banks and in areas that were disturbed by the equipment used to complete the restoration work.
In 2015, an USHP was completed on the upper section of Shelly Creek, above Hwy 19. The results showed that much of the 2 km of creek above Hwy 19 has been excavated. This has resulted in significant changes to the natural hydrology of the watershed. Click here to read the complete report, Shelly Creek Stream Assessment and Fish Habitat Survey Report-2014 and 2015.
In an effort to understand how these changes to the stream’s hydrology can be modified to improve the stability of the creek, and hence the water quality, MVIHES hired one of British Columbia’s experts on water engineering, Jim Dumont, P.Eng., to study the creek and provide us with a report. The report is complete and is titled: Shelly Creek Water Balance and Sediment Reduction Plan, Technical Summary.