Riverbank Stabilization Inventory DRAFT

Prepared by: Shallan Dawson & Mike Schlepp

Kootenai-Shoshone Soil and Water Conservation District 7830 Meadowlark Way, Ste. C-1 Coeur d'Alene ID 83815 April 2003

The Kootenai-Shoshone Soil and Water Conservation District was contracted to compile an Inventory Report of all riverbank stabilization projects that have been installed on the lower St. Joe River and the Lower Coeur d'Alene River. The first part of the inventory involved researching projects that have been installed. The second part of the inventory was to survey the projects that are currently visible from the river. This would have included the GPS point of the project, and a visual inventory, documenting the existing material and a photograph. The third part of this inventory was to include a qualitative analysis performed by the State of Idaho, The Coeur d'Alene Tribe and a representative of the Federal Government. The survey, GPS, photographs, and Qualitative Analysis could not be completed for this report due to river level elevations submerging portions of the streambank protection projects. The following report is the first part of the inventory, which includes a compilation of all projects that were permitted by the Idaho Department of Lands, the US Army Corps. of Engineers and the Coeur d'Alene Tribe. Other information on projects was obtained from MFG, and Idaho Department of Environmental Quality. For ease of reading this report is sectioned into two parts, the Lower St. Joe and the Lower Coeur d'Alene Rivers. For the St. Joe River, any designs that are similar, were briefly described, and permit numbers are listed with a representative drawing on the following page. If the design was unique the permit number is listed in the description and the design drawing follows. For the Coeur d'Alene River, the project name, date installed, cost of project and design is listed. Any other information is attached in the following pages (i.e. monitoring information or photos). All information provided in this report has been obtained from public records, or with permission from the landowner or entity that paid for the work.

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Lower St. Joe River from St. Joe city to Coeur d'Alene Lake

A majority of the projects on the St. Joe River consist of rock placed in the high water zone. Of 31miles of river, or 327,360 feet, a total of 39,864.5 feet have been stabilized, or 12% of the total riverbanks. The bullets below provide a brief description of the projects that were implemented on large amounts of riverbanks, or had a unique design. î Angular rock, placed on top of filter fabric was toed in at elevation 2121’. The rock was placed continuously up the bank, above the high water mark. This method was installed on 3874.5 feet of riverbank. îThis design, installed on 1852 feet, uses angular rock above and below the high water mark. A filter fabric was installed under the rock. There was no vegetative component to this design. îGabion baskets were placed at high water mark for 410 feet of riverbank. î Angular rock 6”-8” was placed on the eroding bank, on top of filter fabric anchored to the top of the bank 12”-18” deep. îSmall rock, one foot in diameter and smaller, placed in the high water zone, on top of a filter fabric was placed on 550 feet of riverbank. î Angular rock was placed on 1805 feet of riverbank. There was no filter fabric, or vegetative component. î Angular rock placed in the high water zone is covered by filter fabric, and placed in the toe trench, covered by angular rock and pea gravel. This is topped by sand above the high water mark. This is installed on 690 feet of riverbank. î Angular rock 1”-4” was placed on the riverbank 24” deep, and toed in on top of filter fabric. This was installed on 6,900 feet of riverbank. Of that, 6,500 was placed continuously. î On 350 feet or riverbank rock was placed on top of filter fabric in the high water zone. Under the toe trench, a footing was installed. î Filter fabric was placed on the riverbank, from the low water mark to above the high water mark. Angular rock was placed on the filter fabric, and pea gravel covered the angular rock. This was installed on 218 feet of riverbank. î Cinder blocks were placed for 50 feet of riverbank, at high water mark. They were placed with the holes up, and willow chutes were planted in the holes. 3

î Angular rock was placed from the bottom of the river, to several feet above the high water mark to protect the dike. This was placed on 12,200 feet of continuous riverbank. î Angular rock 8” or smaller was placed in a wedge in the wave action zone, or high water mark. Willows were planted into the bank, behind the rock, and cottonwoods were placed 10’ back from the river bank. This was installed on 8,600 feet of riverbank. _____________________________________________________________________________________

Drainage: Lower St. Joe River Design: This method places angular rock above and below the high water mark (elevation 2128’). A filter cloth is placed under the rock, and the slope of the bank is usually kept at 1.5:1. The rock is angular and the designs do not specify the size of rock used. There is no vegetation used in this design. This method uses installation from land. Permit Numbers and length of stabilization: Permit # L-95-S-3738 L-95-S-4381 L-95-S-4385 L-95-S-4276 L-95-S-4372 L-95-S-4371 L-95-S-4370 L-95-S-4357 Total

Legnth in feet 240 180 235 360 120 240 239 238 1852

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Drainage: Lower St. Joe River Design: Angular rock is placed above and below the high water mark(elevation 2128’), with filter fabric placed under the rock. This design places a toe trench at the bottom of the rock placement. The toe trench can be 2’x2’, or 2’x3’, and always placed at elevation 2121’, the low water mark. This method is installed from land. Permit numbers and length of stabilization: Permit # L-95-S-3982 L-95-S-3937 L-95-S-4647 L-95-S-4037 L-95-S-4065 L-95-S-4063 L-95-S-3998 L-95-S-3987 L-95-S-4113 L-95-S-4168 L-95-S-4285 L-95-S-3477 Total

Legnth in feet 485 50 200 114.5 115 300 110 65 165 120 2000 150 3874.5

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Drainage: Lower St. Joe Design: Gabion baskets keyed in at high water level. The design does not specify the size of the baskets, or the size of rock in the baskets. There is not vegetative component for this design. Permit number and length of stabilization

Permit # L-95-S-4010 L-95-S-3227 L-95-S-3222 Total

Legnth in feet 80 100 230 410

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Drainage: Lower St. Joe Design: Rock, one foot in diameter and smaller, is placed against the bank to the high water mark (elevation 2128’). The design has 4 oz filter fabric under the rock. There is no vegetative component to this design, and this was placed from land. Permit # L-95-S-3136A L-95-S-4032 Total

Legnth in feet 350 200 550

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Drainage: Lower St. Joe Design: Angular rock 6”-8” is filled into the eroding bank. The rock is placed on the top of the bank, slightly higher than high water mark (elevation 2128”). Filter fabric is below the rock, and anchored on shore by burial 12”-18” deep at the end of the rock. Permit # L-95-S-4093 L-95-S-3594 L-95-S-3563 L-95-S-3593 L-95-S-3621 L-95-S-3650 L-95-S-3668 L-95-S-3674 Total

Legnth in feet 115 122 105 120 100 105 115 115 897

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Drainage: Lower St. Joe Design: This design simply has angular rock placed above and below the high water mark. There is no vegetative component, or description of rock type used. Permit # L-95-S-3210 L-95-S-3718 L-95-S-3159 L-95-S-3405 L-95-S-3354 L-95-S-4587 L-95-S-3873 L-95-S-4447 Total

Legnth in feet 350 115 200 115 500 375 100 50 1805

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Drainage: Lower St. Joe Design: Permit # L-95-S-3478 uses filter fabric against the eroding bank, with gravel placed on top of the fabric. Larger rock is placed on top of the gravel. This method was implemented along 500 feet of riverbank.

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Drainage: Lower St. Joe Design: Permit # L-95-S-3358 uses filter fabric against the eroding bank. Large boulders are placed in the high water mark. Smaller rock with bentnite mixed in will be placed behind and around the large boulders. Four inches of bentnite will be placed on top of the small rock. This method was implemented along 178 feet of riverbank.

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Drainage: Lower St. Joe Design: This design uses pea gravel against the eroding bank. A toe trench is installed at the low water mark, and filter fabric is placed at the bottom of the trench, covers the pea gravel, and is anchored by the top of the bank. Angular rock is placed in the toe trench, covering the filter fabric to the top of the bank. Sand is placed on top of the angular rock, from the high water mark to the top of the bank. This method was implemented along 115 feet of riverbank. Permit # L-95-S-3855 L-95-S-4100 L-95-S-4089 L-95-S-3934 L-95-S-3941 L-95-S-3958 Total

Legnth in feet 115 120 240 110 unknown 105 690

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Drainage: Lower St. Joe Design: This design uses rock 1.5” or larger above and below the high water mark, and into a toe trench. Rock 10”-12” is placed on top of the smaller rock. This method was implemented along 105 feet of riverbank. Permit # L-95-S-3123 L-95-S-3901 L-95-S-3907 Total

Legnth in feet 105 120 120 345

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Drainage: Lower St. Joe Design: Permit # L-95-S-3758 used 1’-4’ rock, 24” deep to armor the riverbank. The rock was placed on top of filter fabric, and set at a 2:1 slope. The rock was toed in 2’-3’ deep and a drain pipe was installed to carry runoff from the bank directly into the river. This was installed by DAW Forest Products Co., and includes a paved log deck on top of the riverbank. This design was implemented along 400 feet of riverbank. Permit # L-95-S-3879 used a similar design on 6,500 feet of riverbank. The difference between the two designs was the drain pipe installed at the log deck, was not installed on this portion.

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Drainage: Lower St. Joe Design: Permit # L-95-S-3962B used rock 12”-24” placed on the riverbank starting at the low water mark, and continuing up the bank to the top of the Dike to elevation 2137’. This design was implemented on 100 feet of riverbank.

Drainage: Lowe St. Joe 22

Design: Permit # L-95-S-3461 used the existing toe trench to install a footing in the bottom, and placed filter fabri c starting at the low water mark continuing up the riverbank. Rock armoring would then be placed on top of the filter fabric. This extended for 350 linear feet on the riverbank.

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Drainage: Lower St. Joe Design: This method used filter fabric placed from below the low water mark up the riverbank above the high water mark. Large rock was placed on top of the fabric; gravel was placed on top of the larger rock. Permit # L-95-S-3931 L-95-S-4316 Total

Legnth in feet 91 127 218

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Drainage: Lowe St. Joe Design: Permit # L-95-S-4458 used 8”x8”x16” cinderblocks, with holes in the middle, placed on the sill of the eroding riverbank at the high water mark elevation 2128’. They were placed in one layer with the holes facing upward. Willows were planted in the holes of the blocks. This was implemented along 50 feet of riverbank.

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Drainage: Lower St. Joe Design: Permit # L-95-S-4337 placed rock from the bottom of the river to several feet above the high water mark. This was installed on 12,200 feet of riverbank.

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Drainage: Lower St. Joe Design: Permit # L-95-S-3966 used rock 1’ and smaller placed in a trench 2’ deep, filled up extending above high water mark, and extending 3’into the river. This design was implemented along 345 feet of riverbank.

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Drainage: Lower St. Joe Design: The United States Department of Agriculture, Natural Resources Conservation Service designed and implemented this method, using partial funding from their Environmental Quality Incentives Program. This design involved armoring the riverbank with rock 8” or smaller, well graded placed in a wedge. Before the rock was placed, willow bundles were placed in the water zone every 20 feet. Various types of trees and shrubs were placed every 20 feet on the riverbank. An electric fence was installed to keep gra zing animals from destroying the newly planted shrubs. This was installed on 8,600 feet of riverbank.

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