Att11_TetonDam_InspRpt_0004.pdf

DAM SAFETY INSPECTION REPORT

Name of Dam: Teton Dam Date Inspected: 9/28/2016

DAM SAFETY INSPECTION REPORT

Geographical Data Classification Data Inspector Data Name of Dam: TETON RESERVOIR NID #: WY01478 Current Hazard Class (L/S/H): L Date of Inspection: 9/28/2016

Administrative State: WY Population at Risk (High Hazard Only): Inspector Name: John Treacy, Andrew Moss

Geographic State (if diff): Weather: Sunny, 75° F @ 3:00 pm

County: CARBON

Field Office: RAWLINS Size Class (Minor/Small/Inter/Large): SMALL Date of Last Inspection: 9/19/2011‐ NOC

Section: 24 T: 19N R: 88W Type of Dam (If not earth): Safety issues/warnings for inspectors:

Aliquot Part: NE ¼, SW ¼ Safety Rating (0‐9 & description) 7 ‐ GOOD

Latitude at Benchmark (nearest 10th) : 41.604343 River/Stream Crossed: LITTLE SAGE CREEK Driving Directions to Dam: HWY 71 SOUTH

FROM RAWLINS, GO ABOUT 15 MILES, DAM IS

ON LEFT (EAST SIDE), SIGNS ARE POSTED Longitude at Benchmark(nearest 10th): ‐107.256919 Seismic PGA (high haz only):

Meridian: 6TH PM Date Dam Constructed: 3/24/1966

BLM ID No.: 1062 Date Dam Modified: 12/94

FAMS No.: L63582 Plan/Section Dwg No.:

For High Hazard dams, note any low water crossings, private land crossings, locked gates, poor roads, etc.:

Describe any development within 3 miles downstream since the last inspection. If none, write “None.”: NONE

Describe any active County, State or Federal roads, active railroads, or utilities within 3 miles downstream. If none, write “None”. For County roads, list the number of vehicles per day: NONE

Dimensional Data

Benchmark Elevation: Station __3+00__________

A 100.00’ Slope of Upstream Face (H:V): O 3:1

Dam Crest Elevation (max):

Station _7+00___________

B 102.86’ Principal Spillway Outlet Invert Elevation: Station _3+00___________ P 69.55’

Dam Crest Elevation (minimum):

Station __1+00__________

C 100.92’ Principal Spillway Outlet Diameter: Q 36”

Emergency Spillway Crest Elevation:

Station __13+35__________

D 95.63’ Low‐Level Gated Outlet Invert Elevation: Station _3+00___________ R Same as PS

Principal Spillway Inlet Invert Elevation:

Station _3+00___________

E 89.24’ Lowest Point on the Downstream Toe Elevation:

Station _3+00___________ S 69.5’

Principal Spillway Inlet (Riser) Diameter:

F 54” Distance From Centerline of Dam to Outlet of Principal

Spillway:

T 73’

Principal Spillway Material: (m/c/p) STEEL Distance From Centerline of Dam to Outlet of Low‐ Level Gated Outlet:

U 73’

Principal Spillway Drop Inlet Height (Riser): G 19.45’ Distance From Centerline of Dam to Lowest Point on Downstream Face:

V 70’

Water Level at Survey Date Elevation:

Station _3+00___________

H 88.07’ Slope of Downstream Face (H:V): W 2:1

Lowest Point on the Upstream Toe Elevation: I 88.07’ Crest Width: Station _3+00___________ X 24”

Low‐Level Gated Outlet Inlet Invert Elevation:

Station _3+00___________

J Not Accessible Dam Crest Length Along Centerline of the Dam: Y 1,147’

Low‐Level Gated Outlet Diameter: 24” K 24” Emergency Spillway Width at the Crest: Z 136’

Low‐Level Gated Outlet Material: (m/c/p) STEEL Emergency Spillway Length at the Crest: AA 595’

Distance From Centerline of Dam to Inlet of Low‐ Level Gated Outlet:

L Unknown Emergency Spillway Sideslope on Left (H:V): BB 3:1

Distance From Centerline of Dam to Lowest Point on Upstream Face:

M 53’ Emergency Spillway Sideslope on Right (H:V): CC 5:1

Distance From Centerline of Dam to Inlet of Principal Spillway:

N 56’ Reservoir Surface Area (Acres) at Emergency Spillway Crest:

DD 105.9

AC

Calculated Data

Calc1. Hydraulic Height (D‐S): 26.13’ Calc7. Principal Spillway Outlet Pipe Length (T+N): 129’

Calc2. Structural Height (B‐S): 33.36’ Calc8. Low Level Gated Outlet Pipe Length( U+L): UNKNOWN

Calc3. Minimum Freeboard (C‐D): 5.29’ Calc9. Estimated Max Reservoir Storage ((DD * Calc6.) / 3) : 266.9 AF (1)

Calc4. Normal Storage Depth (E‐I): 1.17’ (1) Calc10. Volume of Embankment:

(((Calc2. * Y) * (X + ((Calc2. * O)/2) + ((Calc2. * W)/2))) / 54)

76,103 CY

Calc5. Actual Storage Depth (H‐I): 0’ (1) Other:

Calc6. Maximum Storage Depth (D‐I): 7.56’ (1) Other:

Notes:

1 See Figures 1 for Definition of Dimensions 2 Indicate all Dimensions in Feet Unless Otherwise Noted 3 If reservoir is dry at time of inspection, Actual Storage Depth is “0” 4 Datum for permanent benchmark shall be Elevation 100’ 5 For Calc10. Dimensions O & W are slope ratios and

All other parameters are in Feet, The Answer is in Cubic yards.

Inspector Signature: _________________________________ Date: _________________________

6/1/2017

Figure 1. Definition of Dimensions

Directions:

1 Check the NA, YES/NO or Corrective Action Recommended (CAR*) columns as required.

2 Use the same Flag # if quantities for similar items will be calculated and grouped together in the Recommended Work Summary.

3 Use Item #’s to identify items on the Recommended Work Summary.

Item No. Item N/A Y N CAR

RIM

Flag No. Remarks

EMBANKMENT

1. CREST

a. Any Visual Settlements X

b. Cracking X

c. Lateral Movement X

d. Visible Sinkhole X

e. Erosion X

f. Trees & Brush X

g. FAMS road on crest X ROAD OVER CREST DOES NOT APPEAR TO BE IN FAMS

h. Rodent holes X

2. UPSTREAM SLOPE

a. Erosion X M SLOUGHING OF RIP‐RAP ALONG ENTIRE U/S TOE

b. Tree & Brush X R 1 MINOR BETWEEN RIP RAP AND CREST

c. Longitudinal Cracks X

d. Transverse Cracks X

e. Visual depression or bulges X

f. Visual Settlements X

g. Visible Sinkhole X

h. Debris X

i. Rodent Holes X

3. DOWNSTREAM SLOPE

a. Erosion X

b. Trees & Brush X R 1 LOW, THICK GRASS MAKES INSPECTION DIFFICULT

c. Longitudinal Cracks X

d. Transverse Cracks X

e. Visual depressions or bulges X

f. Visual settlements X

g. Visible Sinkhole X

h. Boils present at toe X

Item No.

Item N/A Y N CAR RIM Flag No. Remarks

i. Seepage present X M 2 LUSH VEG. ALONG D/S TOE INICATES SEEPAGE OCCURING

j. Rodent Holes X MINOR, DIFFICULT TO SEE WITH TALL GRASS

k. Is Toe Drain Dry X FLOWING STEADILY ~0.5 GPM

4. ABUTMENT CONTACTS

a. Erosion X

b. Visual Differential Movement X

c. Cracks X

d. Seepage present X

e. Trees & Brush X

5. Groin

a. Erosion X

b. Visual Differential Movement X

c. Cracks X

d. Seepage present X M 2

e. Trees & Brush X R 1

6. RESERVOIR CONTROL

a. Recent downstream development X

b. Slides in Reservoir Area X M RIGHT SIDE OF RESERVOIR EXHIBITS HEADCUTS (4)

c. Change in Reservoir Operation X

d. Other large impoundments u/s X LITTLE SAGE CREEK RESERVOIR

e. Evidence of recreational use X BLM REC. SITE (FISHING, CAMPING, ETC)

7. INSTRUMENTATION

a. List Any Instrumentation present X

b. Is Instrumentation functional X

c. Record Measurements X

(see page #54 of Dam Safety Inspection Report Guidelines for Embankment Dams) ‐ EMBANKMENT SAFETY RATING: VERY GOOD 7‐ GOOD

PRINCIPAL SPILLWAY /OUTLET

8. INTAKE STRUCTURE

a. Debris present X WOOD AROUND TRASH RACK, RIP‐RAP IN RISER

b. Concrete Surface Condition X

(1) Spalling X

(2) Cracking X

(3) Erosion X

No.

Item N/A Y N CAR

RIM

Flag No. Remarks

(4) Scaling X

(5) Exposed Reinforcement X

(6) Other, list

c. Joint Condition

(1) Displacement or offset X

(2) Loss of joint material X

(3) Leakage X WATER INFILTRATION INTO RISER 15’ BELOW WSE

d. Metal Appurtenances X METAL TRASH RACK IS CORRODED AND MISALIGNED

(1) Corrosion Present X

(2) Breakage Present X

(3) Anchor System Secure X R 3 TRASH RACK NEEDS TO BE BETTER SECURED

9. CONDUIT

a. Is Conduit Concrete X

b. Concrete Surface Condition X

(1) Spalling

(2) Cracking

(3) Erosion

(4) Scaling

(5) Exposed Reinforcement

(6) Displacement or Offset

(7) Leakage

(8) Other, list

c. Metal Conduit Condition X

(1) Corrosion present X MORE SEVERE AT OUTLET‐ 100% SECTION LOSS AT INVERT

(2) Protection Coating Adequacy X ASPHALT COATING HAS WORN OFF AT OUTLET

(3) Conduit Misalignment X

(4) Leakage X WATER INFILTRATION INTO RISER 15’ BELOW WSE

d. Plastic Conduit Condition X

(1) Displacement or Offset

(2) Leakage

(3) Crushed or Broken

e. Conduit Trashrack Condition X DEBRIS CAUGHT ON TRASHRACK BUT STILL FUNCTIONAL

(1) Operational X

(2) Plugged X

(3) Corrosion/Damage Present X OFF CENTER, NOT SECURED

No. Item N/A Y N CAR

RIM

Flag No. Remarks

10. GATES

a. Flood Gate Condition X

(1) Broken or Bent UNKNOWN, DID NOT OPERATE GATE

(2) Corroded or Rusted UNKNOWN

(3) Regularly Maintained X PROBABLY NOT, CONTROL BOX IS BOLTED SHUT

(4) Gates Operational UNKNOWN

c. Is There a Low Level Gate X

d. Is Low Level Gate Operational UNKNOWN

(see page #54 of Dam Safety Inspection Report Guidelines for Embankment Dams) ‐ PRINCIPAL SPILLWAY/OUTLET WORKS SAFETY RATING: GOOD 5‐ FAIR

EMERGENCY SPILLWAY/OUTLET WORKS

11. STILLING BASIN

a. Concrete Surface Condition: X

(1) Spalling

(2) Cracking

(3) Erosion

(4) Scaling

(5) Exposed Reinforcement

(6) Other, list

b. Joint Condition: X

(1) Displacement or Offset

(2) Loss of Joint Material

(3) Leakage

c. Energy Dissipator Condition X

(1) Deterioration

(2) Covered with Debris

(3) Other, list

d. Channel Condition:

(1) Eroding or Backcutting X

(2) Sloughing X

(3) Obstructed X

(4) Undercut by released water X MINOR UNDERMINING OF THE PS OUTLET CONDUIT

(5) Embankment erosion by water X

e. Gabion Condition: X

No.

Item N/A Y N CAR RIM Flag No. Remarks

(1) Corroded

(2) Basket Misaligned

(3) Basket Settlement

(4) Brush Growing in Gabions

f. Riprap Condition X

(1) Erosion undercut/settlement

(2) Vegetation

(3) Extent of Riprap Adequacy

(4) Migration of Riprap

12. SPILLWAY /OUTLET WORKS

a. Spillway Concrete Condition: X

(1) Spalling

(2) Cracking

(3) Erosion

(4) Scaling

(5) Exposed Reinforcement

(6) Concrete Undercut

(7) Settlement

(8) Other, list

(9) Trees and Brush / Obstructed

b. Joint Condition X

(1) Displacement or Offset

(2) Loss of Joint Material

(3) Leakage

c. Energy Dissipator Condition: X

(1) Signs of Deterioration

(2) Covered with Debris

(3) Riprap Dissipator

(4) Missing

d. Excavated Earth Spillway Cond: X

(1) Slopes Eroding X

(2) Slopes Sloughing X

(3) Headcutting X

No.

Item N/A Y N CAR RIM Flag No. Remarks

(4) Trees and Brush / Obstructed X

e. Natural Earth Spillway Condition: X

(1) Slopes Eroding

(2) Slopes Sloughing

(3) Headcutting

(4) Trees and Brush / Obstructed

f. Damage from Released Water: X

(1) Eroded the Embankment X

(2) Undercutting of Outlet X

(3) Recent Discharge X

(4) Other damage, list X

g. Is weir in good condition X

h. Is Control at Weir X

(see page #54 of Dam Safety Inspection Report Guidelines for Embankment Dams) ‐ EMERGENCY SPILLWAY/OUTLET WORKS SAFETY RATING: GOOD 7‐ GOOD

OVERALL SAFETY RATING: 5‐ FAIR

* UNDER THE CAR/RIM COLUMN – DETERMINE WHAT IS THE CORRECTED ACTION RECOMMENDED (CAR) – REPAIR (R), INVESTIGATE (I), MONITOR (M)

OR “NO” IF NO CORRECT ACTION IS NECESSARY

DO YOU RECOMMEND A HAZARD CLASSIFICATION RE‐ASSESSMENT? EXPLAIN: NO, NO D/S DEVELOPMENT.

OTHER REMARKS / NOTES FOR PHOTOS:

1. STORAGE VOLUME CALCULATION IS INCORRECT. WE COULD NOT MEASURE TRUE U/S TOE SO STORAGE VOLUME CALC. ONLY REPRESENTS

FLOOD STORAGE AND NOT TOTAL STORAGE.

2. SEEPAGE WAS PRESENT ALONG ENTIRE D/S TOE INDICATED BY THE LUSH VEGETATION. DUE TO AGE OF DAM, THIS ISSUE IS MOST LIKELY NOT VERY SEVERE, BUT IT SHOULD BE MONITORED FOR ANY SIGNS OF PROGRESSION, ESPECIALLY DURING HIGH WATER LEVELS.

3. STEADY FLOW WAS OBSERVED AT THE TOE DRAIN OUTLET. TOE DRAIN APPEARS TO BE FUNTIONING AS INTENDED. A GALLON JUG WOULD BE A GOOD ADDITION TO THE NEXT INSPECTION TO MEASURE THE FLOW RATE AT THE PS OUTLET AND THE TOE DRAIN. 2016 APPROXIMATED

FLOW RATE WAS ~0.5 GPM AT THE TOE DRAIN.

4. ALONG THE RIGHT SIDE OF THE RESERVOIR, THE BANKS ARE ERODING/SLOUGHING UP TO 10’ IN SOME SPOTS. THIS ISSUE IS NOT SEVERE AT THE MOMENT AS THE SLIDES ARE BEYOND THE EXTENT OF THE DAM EMBANKMENT. IF THE DETERIORATING PROGRESSES, IT COULD LEAD TO

A LARGE SLIDE INTO THE RESERVOIR.

CALCULATIONS

NOTE: Recommended work items listed below were discovered during the field inspection.

List Flag No.’s from checklist and comment as needed. Group similar items, calculate estimated quantities, and enter totals on Summary.

1. BRUSH REMOVAL (ONLY LOW GRASSES WITH SOME SMALL BUSHES)‐ VEGETATION MAKES PROPER INSPECTION DIFFICULT‐ PERFORM PRIOR TO

NEXT INSPECTION IN 2021:

U/S FACE: 25’ WIDE X 1147’ / 9 = 3186 SY

D/S FACE: 75’ WIDE X 1147’ / 9 = 9558 SY

TOTAL: =12,744 SY

2. MONITOR SEEPAGE

3. SECURE TRASH RACK

4. VIDEO INSPECT LEAKAGE IN PRINCIPAL SPILLWAY RISER

Inspector Signature: _____________________________________ Date: ___________________________

6/1/2017

RECOMMENDED WORK SUMMARY

ITEM

NO. ITEM WORK

TYPE EST QTY UOM UNIT COST TOTAL

COST REMARKS

9999 BRUSH REMOVAL DM 2.7 AC $2,745.85 $7,414 Machine Brush Clearing (including removal) (.25 acre min. order) – 12,744 sy/ 4,840 sy per acre = 2.7 acre

SECURE TRASH RACK DM 1 LS $1,000 Re‐secure trash rack to the concrete foundation

10165 VIDEO INSPECT PIPE DM 1 LS $820 $820

Pipe Inspection TV Camera with Video (up to 500 LF)

10147

MOB/ DEMOB ( 2

trips x 25 loaded miles =50 miles)

50 MILE

LOADED

HAUL

MI $9.77 $489 Mob & Demob Costs/Loaded Mile, Dump Truck & Trailer, 25 Mile Loaded Haul, 25 ton max. tow capacity – move dump truck and dozer

10152 MOB/DEMOB (2

trips x 25 loaded miles = 50 miles)

50 MILE

LOADED

HAUL

MI $12.22 $611 Mob & Demob Costs/Loaded Mile, Truck Tractor & Lowboy Trailer, 25 Mile Loaded Haul, 75 ton max. tow capacity – move excavator

Notes:

1 Costs derived using the FY17 Dam Maintenance Cost Models developed by John Treacy at the NOC in reference to RS Means Standards.

2 Work Types are to be classified as: A = Annual Maintenance D = Deferred Maintenance CI= Capital Improvement 3 UOM = Unit of Measure

REMARKS:

1. DAM IS IN GOOD CONDITION OVERALL. FUTURE INSPECTIONS SHOULD CONTINUE TO MONITOR SEEPAGE TO SEE IF IT WORSENS. TRIMMING THE VEGATION ON THE DAM EMBANKMENT PRIOR TO THE NEXT INSPECTION WOULD ALLOW INSPECTORS TO ADEQUATLY SEE THE EMBANKMENT. NEXT INSPECTION SHOULD MEASURE FLOW RATE THROUGH THE TOE DRAIN OUTLET. PRINCIPAL SPILLWAY LEAKAGE VOLUMES SHOULD BE MEASURED AS WELL BY THE FLOW

RATE AT THE OUTLET.

2. METAL PIPE IS ALMOST 50 YEARS OLD (100% SECTION LOSS AT THE OUTLET INVERT AND LEAKAGE WAS OBSERVED AT THE BASE OF THE INLET RISER.)

RECOMMEND VIDEO INSPECTING THE ENTIRE PIPE. REGULAR OPERATION OF THE PRINCIPAL SPILLWAY GATE WILL ENSURE THE DAM CAN OPERATE AT FULL

CAPACITY IF THERE IS EVER A FLOOD EVENT.

Coordinator, Safety of Dams Signature: _____________________________________________ Date: __________________

6/6/17

PHOTO 1: Principal spillway inlet. Trash rack is misaligned with the concrete foundation but still functional. There was no obvious anchorage, the weight of the trash rack was keeping it in place. Note the debris caught within the trash rack. Rip‐rap and a log were observed inside the vertical riser. The large, vertical steel plate is intended to reduce the whirlpool effect of the water flowing into the riser.

PHOTO 2: Principal spillway gate control box was bolted shut at the time of inspection. Functionality unknown. Note the survey benchmark is located at the principal spillway.

PHOTO 3: Principal spillway outlet. Note the 100% section loss along the invert of the barrel. Recommend a visual camera inspection of the entire conduit to determine the severity of the corrosion/ leakage at the base of the inlet riser.

PHOTO 4: Sloughing of the rip‐rap protection on the u/s face of the dam, near the right abutment. The erosion control fabric is deteriorating along the full length of the dam.

PHOTO 5: Toe drain was flowing ~0.5 GPM at the time of inspection. The toe drain outlet is located near the right abutment and flows into the principal spillway stilling basin. The water flowing out of the toe drain was clear indicating minimal sediment transfer through the embankment is occurring.

PHOTO 6: Looking northeast, d/s, at pipe outlet from dam crest. Stilling basin at outlet makes it hard to inspect for seepage.

PHOTO 7: Looking at the u/s embankment face from the left abutment. There is a boat ramp on u/s side of left abutment.

PHOTO 8: Looking southeast at the d/s toe of the dam. Heavy vegetation indicates seepage is occurring along the d/s toe. Thick vegetation makes it difficult to properly inspect the dam along the d/s slope.

CONDITION RATING CODES

OUTLET WORKS

This describes the physical conditions associated with the alignment, settlement, joints, structural conditions, scour and other items associated with outlet works (intake structures, conduits, gates, and stilling basins).

N Not applicable. Use when the dam has no outlet works

9 EXCELLENT CONDITION ‐ No deficiencies

8 VERY GOOD CONDITION ‐No noticeable or noteworthy deficiencies which affect the operation of the outlet works. Minor debris accumulation on trash racks.

7 GOOD CONDITION ‐ Concrete surfaces have shrink cracks, light scaling and insignificant spalling which does not expose reinforcing steel. Insignificant damage caused by drift with no alignment change and not requiring corrective action. Some minor scouring has occurred near conduit outlet or basin outlet. Metal conduits have smooth symmetrical curvature with superficial corrosion and no pitting. Gates operate smoothly, but may have superficial corrosion and no pitting.

6 SATISFACTORY CONDITION – Minor deterioration or initial disintegration, minor chloride contamination, cracking with some leaching, or spalling on concrete. Conduit outlet or stilling basin has local minor scouring. Metal appurtenances have significant corrosion or moderate pitting. Gate operator stems may be leaking lubricant. Significant debris accumulation at gates and conduit inlets that does not impede flow or operation.

5 FAIR CONDITION ‐ Moderate deterioration or disintegration, extensive cracking and leaching, or spalling on concrete. Minor settlement or misalignment. Noticeable scouring or erosion at the outlet works or the stilling basin. Metal appurtenances have significant distortion and deflection in one section, significant corrosion or deep pitting present.

Gate operator stems have misalignments that do not affect the full operation of the gate. Major debris accumulation at gates and conduit inlets that impedes flow or operation.

4 POOR CONDITION‐ Major spalling, heavy scaling, wide cracks, or exposed rebar in concrete. Conduits, appurtenances, stilling basins, and intakes have major settlement or misalignment. Considerable scour or erosion present at the outlet works or stilling basin. Metal appurtenances have significant distortion and deflection throughout, extensive corrosion or pitting. Gate does not have complete range of operation.

3 SERIOUS CONDITION ‐ Any condition described in code 4 but which is excessive in scope. Severe movement or differential settlement of the outlet works including intake, conduit, stilling basin, and gates. Holes may exist in concrete surfaces. Metal conduits or appurtenances have extreme distortion and deflection in one section, extensive corrosion, or deep pitting with scattered perforations. Gate is not operable.

2. CRITICAL CONDITION‐ Severe settlement in the outlet works. Conduit can no longer support embankment. Piping or seepage present along conduit. Corrective action required to keep dam in service. Metal conduit and appurtenance have extreme distortion and deflection throughout with extensive perforations due to corrosions.

1 “PARTIAL FAILURE” CONDITION ‐ Dam is out of service due to outlet works failure. Reconstruction of the outlet works would put the dam back in service.

0 FAILED CONDITION ‐ Dam has failed. Replacement of the entire structure is necessary.

Good Condition (codes 7‐9) Fair Condition (codes 5‐6) Poor Condition (codes 2‐4) Unsatisfactory (codes 0‐1)

EMERGENCY SPILLWAY

This describes the physical conditions associated with flow of water through spillways such as channel stability and the condition of the spillway, riprap, slope protection, or control devices including spur dikes.

N Not applicable. Use when a dam has no spillway channel.

9 EXCELLENT CONDITION ‐ There are no noticeable or noteworthy deficiencies which affect the condition of the spillway channel.

8. VERY GOOD CONDITION ‐ Spillway channel and banks are protected. Spillway control devices such as spur dikes, weirs and channel protection are not required or are in a stable condition.

7 GOOD CONDITION ‐ Concrete surfaces have shrink cracks, light scaling and insignificant spalling which does not expose reinforcing steel. Spillway channel and bank protection is in need of minor repairs. Spillway control devices and channel side slopes have a little minor damage. Banks and/or channel have minor amounts of drift or vegetation growth.

6 SATISFACTORY CONDITION ‐ Minor deterioration or initial disintegration, minor chloride contamination, cracking with some leaching, or spalling on concrete. Spillway banks are beginning to slough. Spillway control devices and channel protection have widespread minor damage. There is minor spillway channel bed movement (erosion) evident.

Debris and/or vegetation (short, less than 1 foot in height) are restricting the waterway slightly.

5 FAIR CONDITION ‐ Moderate deterioration or disintegration, extensive cracking and leaching, or spalling on concrete. Spillway protection is being eroded. Spillway control devices and/or channel side slopes have major damage. Trees and brush restrict the channel.

4 POOR CONDITION‐ Major spalling, heavy scaling, wide cracks, or exposed rebar in concrete. Spillway and channel side slope protection is severely undermined. Spillway channel has severe headcutting and widespread erosion. Spillway control devices have severe damage.

3 SERIOUS CONDITION ‐ Concrete has loss of section, deterioration, or spalling has seriously affected the primary structural components. Shear cracks in concrete may be present. Spillway protection has failed. Spillway control devices have been destroyed. Channel aggradation, degradation or lateral movement has changed the spillway to now threaten the dam.

2 CRITICAL CONDITION‐The spillway has changed to the extent that the Dam or the spillway is near a state of failure. Advanced deterioration of primary structural elements.

Shear cracks in concrete may be present and leaking water.

1 “PARTIAL FAILURE” CONDITION ‐Dam is out of service due to spillway failure. Reconstruction of the spillway would put the dam back in service.

0 FAILED CONDITION ‐ Dam has failed. Replacement of the entire structure is necessary.

EMBANKMENT

This describes the physical conditions associated with the alignment, settlement, joints, structural conditions, scour and other items associated with concrete and earth fill embankment dams.

N Not applicable. Use when the dam has no outlet works

9 EXCELLENT CONDITION ‐ No deficiencies – “like new”

8 VERY GOOD CONDITION ‐No noticeable or noteworthy deficiencies which affect the condition of the embankment. Upstream face is protected with riprap or other slope protection.

7 GOOD CONDITION ‐ Concrete surfaces have shrink cracks, light scaling and insignificant spalling which does not expose reinforcing steel. Some minor wave action scouring has occurred on the upstream face. Embankment has minor amounts of vegetation growth (trees and brush).

6 SATISFACTORY CONDITION – Minor deterioration or initial disintegration, minor chloride contamination, cracking with some leaching, or spalling on concrete. Minor amounts of rodent holes, cracking, surface erosion and seepage present. Embankment has vegetative growth (trees and brush) covering large portions of the embankment. Vegetation is less than 3 feet in height.

5 FAIR CONDITION ‐ Moderate deterioration or disintegration, extensive cracking and leaching, or spalling on concrete. Minor settlement, depressions, or bulges present in the embankment. Minor differential movement present at the abutment contacts. Major amount of rodent holes, cracking and erosion present in the embankment and associated slope protection. Embankment has vegetative growth (trees and brush) covering large portions of the embankment. Vegetation is less than 5 feet in height.

4 POOR CONDITION ‐ Major spalling, heavy scaling, wide cracks, or exposed rebar in concrete. Major settlement, depressions, or bulges present in the embankment. Severe amount of rodent holes, cracking and erosion present in the embankment and associated slope protection. Indication of sinkhole and/or boils developing in the embankment.

Major differential movement present at the abutment contacts. Embankment has vegetative growth (trees and brush) covering large portions of the embankment. Vegetation is greater than 5 feet in height.

3 SERIOUS CONDITION ‐ Any condition described in code 4 but which is excessive in scope. Severe movement or differential settlement of the embankment. Major amount of sinkhole and/or boils present in the embankment or downstream toe. Piping is evident. Sediment is present in seepage. Rate of seepage has increased from previous monitoring. Concrete has loss of section, deterioration, or spalling has seriously affected the primary structural components. Shear cracks in concrete may be present.

2. CRITICAL CONDITION – Advanced deterioration of primary structural elements. Shear cracks in concrete may be present and seeping water. Dam embankment is near a state of failure.

1 “IMMINENT FAILURE” ‐ Dam will fail if not taken out of service. Reconstruction of the embankment would put the dam back in service.

0 FAILED CONDITION ‐ Dam has failed. Replacement of the entire structure is necessary.