DINGMANS CREEK, SITE 4, SMALL SLIDE, DELAWARE WATER GAP PROJECT VEGETATED KEYS; TRAFFIC CONTROL STONES; PLANTINGS; SINGLE STONE BENDWAY WEIRS; & A RANDOM BOULDER FIELD FOR ROUGHNESS & AQUATIC HABITAT

CONTACT: LOCATION: In the northern section of the Delaware Water Gap National Recreation Area, proceed north on Rt. 209, slow down when the “DINGMANS FALLS” sign appears. Turn west onto Dingmans Falls Road. Proceed approx. ½ mile, project is on the north (right side) of the road about 100 ft from the road. If you cross the bridge you have gone too

PROBLEMS  For approximately 200 ft Dingmans Creek is flowing against & eroding the left valley wall (estimated height 35 ft). The amount of fine sediment delivered to the stream is significant. This entire colluvium slide is very unstable. If erosion progresses at this site it may kick the stream back toward the park road downstream and create a threat to road stability (Johnny B. Mountain Road).  The point bar (right side) of the channel is very rough with a number of boulders increasing the hydraulic roughness & impeding flow.

PRE-PROJECT PHOTOS by Dave Derrick Dec. 15, 2008 (HIGH WATER) LEAF OFF CONDITION

HIGH WATER-Looking project bank. Stream is obviously eroding this bank, which contributes significant sediment to the system PRE-PROJECT DINGMANS CR-SITE 4 PIX BY DERRICK

HIGH WATER-Looking DS toward DS end of project. PRE-PROJECT DINGMANS CR-SITE 4 PIX BY DERRICK

THE PLAN

 35 Vegetated Traffic Control Stones (TCS)  Every 4 th TCS is keyed 10 ft into the bank (perpendicular) with rooted Black Willow whips & other live poles planted at a rate of 3 plants per ft.  Every 4 th TCS has a Single Stone Bendway Weir (SSBW) to move the thalweg away from the left bank & toward the center of the channel approximately 5-8 ft.  The space between & behind the TCS is heavily vegetated with a variety of species of rooted-stock trees & shrubs.  The loose eroding talus slope slide was heavily planted with several species of rooted-stock shrubs & trees  Native boulders from the point bar were placed as a random boulder field streamward of the TCS & SSBW. METHODS EMPLOYED

Courtesy of Ecological Restoration, Inc. Correction: There should be 3 Traffic Control Stones between each Single Stone Bendway Weir, not 2.

SOLUTIONS (THE PLAN)  This project is designed to stabilize 200 ft of the bank at the present location by increasing roughness of the entire bank with 3 gallon container rooted-stock trees & shrubs.  Hard protection is limited to the toe & includes 35 vegetated Traffic Control Stones (TCS). TCS were typically 3 ft by 3 ft by 4 ft & spaced 3 to 6 ft apart. Every 4 th TCS was keyed 8 to 10’ into the bank & had a Single-Stone Bendway Weir (SSBW) placed at the stream end. Live poles were placed in the key trench before stone was placed. Eight SSBW were built.  A random natural bedload boulder field was placed around & in front of the SSBW & TCS’s.

Courtesy of Ecological Restoration, Inc. SSBW TCS Key

PLANTS PLANTED  Gray Birch 50 2 gallon pots  Gray Birch 200 unrooted poles  Buttonbush 25 bare root  Silky Dogwood 200 bare root  Ninebark 175 bare root  Rhododendron 50 3 gallon pots  White Pine150 3 gallon pots Common Name # Size

Two healthy Single Stone Bendway Weir (SSBW) stones. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK

CONSTRUCTION PHOTOS by Dave Derrick, September 19-20, 2009

Traffic Control Stones (TCS) sized about 3 ft by 3 ft by 4 ft, dug into the bed & bank, designed to stabilize & roughen the bank, are spaced 3 to 6 ft apart. Every 4th TCS is keyed into the bank & has a Single Stone Bendway Weir attached. 8 SSBW total Traffic Control Stones (TCS) with Single Stone Bendway Weirs (SSBW) & vegged keys & pole plantings Key TCS Key TCS SSBW TCS SSBW Key Thalweg Key

Rooted–stock container shrubs & trees added to Traffic Control Stones at toe & all bare areas of the entire eroding bank Key TCS Key TCS SSBW TCS SSBW Key Thalweg

CONSTRUCTING THE VEGETATED KEY, TRAFFIC CONTROL STONE, & SINGLE STONE BENDWAY WEIRS FOR # 4 & 5.

Place Live Poles against both sides of trench Detail for key Flow

Detail for key Flow Place stone in key trench.

Looking stone being placed in the key for Bendway Weir #4. Live poles have already been placed in the key trench. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK

Close-up of stone being placed in key for BW #4. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK

Looking key installation of BW #5. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK

Looking live poles & key stones in BW #5. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK

Choke stone with gravel-cobble (white areas) & water in Detail for key Flow

Backfill and overfill with native soils, then compact (some settling will still occur) Detail for key Flow

Seed DONE WITH THE KEY Detail for key Flow

Close-up of a Single Stone Bendway Weir (SSBW) & vegged key & pole plantings Thalweg Key TCS SSBW Key

CONSTRUCTION COMPLETE Photos by Dave Derrick SEPT. 24, 2009 Very natural, minimal structure approach

Construction complete, looking 175 ft of the 200 ft long project. This should look completely natural in a couple years!! CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

Construction complete, looking DS. TCS, Single Stone Bendway Weirs, random boulder field, many pole plantings & rooted-stock plants provide plenty of toe of slide. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

Construction complete, the random boulder field & planted slide. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

Construction complete, looking Bendway Weir #3, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

Construction complete, looking Bendway Weir #4, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

Construction complete, looking Bendway Weir #7, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

Construction complete, looking dense rooted-stock plantings of trees & shrubs on the DS 1/3 of the slide area CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

Construction complete, looking Bendway Weir #5, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK

1 YEAR AFTER PROJECT COMPLETION Photos by Dave Derrick SEPT. 12, 2010

1 YEAR LDB Bendway Weir #1. BW is stable, plantings are growing, upper bank stable. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Bendway Weir #2. Plantings will trap & stabilize eroded material from the upper bank. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR plantings & Bendway Weir #2. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR Bendway Weir # 2 & plantings. All stable, growth good, deep pool off stream end of Bendway Weir. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Looking well-aligned channel with stone & veg roughness on outer bank throughout the bend. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Stream has put almost all of the stone in compression (imbricated) 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Mid-project Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Mid-project Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-End of project Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Looking great functioning channel & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Looking Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Looking US stable mid-section of project. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

1 YEAR LATER-Looking robust plantings that will stabilize the bank & trap coluvium for bare areas of upper bank. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK

Cleophus says “Geaux Saints”