INSPECTION AND MAINTENANCE PLAN

                         GARNET LAKE CONSERVATION ASSOCIATION

INSPECTION AND MAINTENANCE PLAN

Prepared By:  Garnet Lake Conservation Association Dam Committee (GLCADC) 

                      Date Last Revised: Jan. 29, 2025

Location of Dam Inspection and Maintenance Plan (I & M):  Copy to be kept by President, Dam Committee Chair and both Vice Presidents of the Garnet Lake Conservation Association (GLCA)  

Part 1:  Dam Data

Dam Name:  Garnet Lake Dam

Dam State Identification Number:  186-0574

Dam Hazard Classification:  Small C-High Hazard

Date of last Hazard Class Verification:  April 13, 2010

Dam Location: County:  Warren                Town: Johnsburg

                       Latitude: 43 32 18    Longitude: 74 0 49

Dam Type: concrete, rock and earthen embankment

Year of original construction: 1952.  Year of last construction activity: 1989

Name of last Engineer and Builder: Morse Engineering, Town of Johnsburg

Dam Use(s):  recreation

Dam Owner: Garnet Lake Conservation Association, Inc.

Inspection and Maintenance Coordinator available at Garnetlake.org

Reservoir and stream: Mill Creek (outflow) non- navigable. Unnamed stream from Round Pond (inflow)

Associated wetlands and other natural resources of special concern: None

Dam height: 15 feet

(As measured from downstream toe at lowest point to top of dam)

Dam Crest length: 160 feet

Dam Crest width:  paved crest with 40 feet bottom width and 1V:20H side slopes 

Maximum Impoundment Volume: 957 acre-feet

County and Town within downstream inundation zone:

Town of Johnsburg in Warren County (See Garnet Lake Emergency Action Plan).

Normal Pool Elevation: 1462.6 feet

         (3’’ of water thru culverts)

Primary Spillway: Concrete shelf with three concrete arch culverts (3.75 ft. high by 5.75 ft. wide). The concrete shelf and culverts support a Town bridge and roadway.

Auxiliary/Emergency Spillway Elevation: 1465.36 feet, approximately 40 feet wide

Top of Dam (roadway over culverts) 1468.15’

Water level at Spillway Design Flood (1/2 PMF) 1470.82

Creek Elevation at bottom of dam 1453’

Part II: Dam Inspection and Maintenance

Party responsible for Dam Operations: GLCA

Current Contact Information available at Garnetlake.org

A. INSPECTION PLAN

I INSPECTION TYPE

FREQUENCY

ITEMS TO INSPECT/MONITOR

PERSONNEL

Informal

(i.e. storm events,

snow melts)

As needed, after event

Spillway/Aux. Spillway/Seepage

Designated Dam Observers Available at Garnetlake.org

Informal

Monthly

Seepage/Wet Areas/ Toe Drain Flow/ Pool Level/ Trash Rack Debris/ Slides/Cracks/ Rodent Activity/ Vegetation/ Concrete Surfaces/ Vandalism/

Designated Dam Observers Available at Garnetlake.org

Maintenance

Annually

In addition to above items: Slope Protection/Riprap Erosion/ Condition of Vegetative Cover/ Spillway and embankment Condition

GLCA

Technical

Periodic- 5 year intervals

Safety Inspection

(See Part 673.12)

Engineer-need not submit to DEC. Must

keep report on file and provide to DEC on request.

Technical

Periodic  (Within 1st five years, then  every 10 years after)

Engineering Assessment

(See Part 673.13)

Engineer-must file an 

Assessment Report with DEC.

B. MAINTENANCE

The following items will be performed annually.

1.     Weedwack weeds and brush along embankment and emergency spillway

2.     Re-establish proper vegetative cover as necessary

3.     Address erosion

4.     Address rodent damage

5.     Clean trash rack

6.     Replace/ replenish riprap

7.     Concrete Maintenance

C. OPERATION

Record keeping procedures- completed monthly inspection reports (Appendix A) will be immediately emailed to the designated IMA Coordinator for inclusion into the official GLCA record.  A hard copy will also be provided to the record keeper.  The dam observer will immediately notify the dam committee chair of any observations requiring further investigation or repair.

Part III: Training

All persons involved in the Inspection and Maintenance Plan (“Plan”) shall be trained to ensure that they are thoroughly familiar with the elements of the plan and their duties under the plan.  The Garnet Lake Conservation Association Dam Committee shall conduct Training and review of the plan. These meetings shall include, but are not limited to, the following:

·  Review general responsibilities and inspection procedures

·  Review reporting and record keeping procedures

·  Review annual maintenance procedures

·  Review inspection and maintenance procedures at the dam site

·  Discuss and any additional information or features that should be included in the Plan.

All holders of the inspection forms (Appendix A) shall receive updated sheets or sections whenever changes or revisions are made to the Plan. 

Training and Review shall be performed at least once every two years.

Part IV: Notifications

Form

Submittal Date

Annual Certification

By January 31, of each year

Incident Report Form (EAP Activation, Flow in Auxiliary Spillway)

Within 5 days of incident

Notification of Property Transfer

Sale of property where dam is located

Part V:  Contact/Forms available at Garnetlake.org

Note : DEC Inspection Reports available at Garnetlake.org, including :

Monthly Inspection Reports

DEC Inspection Reports