minnehaha creek reach 14 streambank improvement project
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Minnehaha Creek – Reach 14 Streambank Improvement Project. Design Concept 1 – From the Creek. Is this a “fun” stream to paddle? The allure of a journey, what’s around the next bend? Viewing wildlife Viewing architecture Hearing the sounds Connecting with the water.

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design concept 1 from the creek
Design Concept 1 – From the Creek
  • Is this a “fun” stream to paddle?
  • The allure of a journey, what’s around the next bend?
    • Viewing wildlife
    • Viewing architecture
    • Hearing the sounds
    • Connecting with the water
is natural buffer strong enough
Is Natural Buffer Strong Enough?
  • Project feasibility study included hydraulic modeling
    • Average bankfull shear stress = 0.43 lb/ft2
    • Max, 100 yr shear stress at France Ave. weir = 1.2 lb/ft2

By the numbers, in general nothing larger than 6” rock is required.

Homeowner observations?

design concept 2 from the home
Design Concept 2 – From the Home

Is this the “best” stream to live on?

Different aesthetic preferences

Neat & orderly

Manicured

Natural & organic

  • Different desires in ownership
    • Viewing wildlife
    • Viewing the stream
    • Hearing the sounds
    • Access to the water
    • Separation from neighbors
variable site conditions
Variable Site Conditions
  • Sun exposure (Full sun to full shade)
  • Slope
  • Existing rip rap (rock) or retaining wall
  • Variable water levels
  • Existing structure or gardens
sun exposure
Sun Exposure

Full Sun to Full Shade – There are natives for that

Images courtesy of Prairie Moon Nursery

existing turf grass remove re vegetate with native buffer
Existing Turf Grass – Remove & Re-Vegetate with Native Buffer
  • Rely on the strength of the deep growing roots.
existing rip rap cover w soil re vegetate with native buffer
Existing Rip Rap – Cover w Soil & Re-Vegetate with Native Buffer

Minneapolis Avenue

Minnetrista, MN

existing retaining wall replace with vegetated rock wall
Existing Retaining Wall – Replace with Vegetated Rock Wall
  • Retaining walls offer no habitat
  • But retaining walls are usually installed for specific reasons
    • Hydraulic protection of bridges and culverts
    • Maximize real estate
  • Vegetated Rock Wall
    • Space between the stones provide edge habitat
    • Reduces the need to regrade the banks
    • Overhanging vegetation can reduce thermal loading of the stream
  • Reflective flow
variable water levels
Variable Water Levels

Excerpts from Shaw, D. and Schmidt, R. 2003, Plants for Stormwater Design

in stream habitat improvements
In Stream Habitat Improvements
  • Root Wads
    • Provide wood debris and cover
    • Protect the bank from erosion
in stream habitat improvements1
In Stream Habitat Improvements
  • Vegetated Brush Mattress
    • Build up eroded areas by trapping sediment
in stream habitat improvements2
In Stream Habitat Improvements
  • In-Stream Boulders
    • Provide small scour pools & current breaks
in stream habitat improvements3
In Stream Habitat Improvements
  • Stream Barbs
    • Diverts flow from eroding banks
    • Capture sediment
in stream habitat improvements4
In Stream Habitat Improvements
  • Coir Logs
    • Capture sediment during high water levels
visit wenck s similar projects
Visit Wenck’s Similar Projects
  • Shingle Creek Drive & Hampshire Ave., Brooklyn Park, MN
    • Stabilize Shingle Creek streambanks, install native buffer and add in-stream habitat for an entire reach
  • 26th Ave & Sycamore Ln Plymouth, MN
    • Stabilize Plymouth Creek streambanks, install native buffer and add in-stream habitat for an entire reach
  • Minneapolis Ave & Crest Ridge Ct., Minnetrista, MN
    • Recreate a waterway out of an eroded gully that can handle urban runoff.
    • Example of vegetated riprap
preparation for the site visit
Preparation for the Site Visit
  • Review your sun condition (sun, part sun or shade).
  • Review the seed list that matches your sun condition.
  • Review the plant list the matched your sun condition and select the one you think will complement the seed list and your landscaping.
  • Review the concept plan and make edits, write down your thoughts and be prepared to discuss.
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