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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Minnehaha creek reach 14 streambank improvement project

Minnehaha Creek – Reach 14Streambank Improvement Project


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 Buffer

  • 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 Pocket’ Boulder Wall

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



Concept plan
Concept Plan Pocket’ Boulder Wall


In stream habitat improvements
In Stream Habitat Improvements Pocket’ Boulder Wall

  • Root Wads

    • Provide wood debris and cover

    • Protect the bank from erosion


In stream habitat improvements1
In Stream Habitat Improvements Pocket’ Boulder Wall

  • Vegetated Brush Mattress

    • Build up eroded areas by trapping sediment


In stream habitat improvements2
In Stream Habitat Improvements Pocket’ Boulder Wall

  • In-Stream Boulders

    • Provide small scour pools & current breaks


In stream habitat improvements3
In Stream Habitat Improvements Pocket’ Boulder Wall

  • Stream Barbs

    • Diverts flow from eroding banks

    • Capture sediment


In stream habitat improvements4
In Stream Habitat Improvements Pocket’ Boulder Wall

  • Coir Logs

    • Capture sediment during high water levels


Visit wenck s similar projects
Visit Wenck’s Similar Projects Pocket’ Boulder Wall

  • 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 Pocket’ Boulder Wall

  • 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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