B08_140FGA24R0008_Att_9_Upper_Cross_Dike_Report.pdf
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- Pahranagat NWR Upper Dam Design/Build Project
- Solicitation number
- 140FGA24R0008
About this file
This document is a SEED inspection report for the Upper Pahranagat Cross Dike, a low hazard potential dam located in the Pahranagat National Wildlife Refuge in Lincoln County, Nevada. The report provides the current safety classification, screening level risk assessment, and hazard classification of the dam, which is categorized as a low hazard dam.
The report outlines two Priority 2 (P2) operations and monitoring recommendations, which include removing small brush and emerging trees from the crest area, and replacing eroded gravel surfacing on the crest. No Priority 1 (P1) recommendations or costs are identified. The report also includes pertinent data on the dam's physical characteristics, discharge structures, reservoir/flood hydrology, owner information, inspection history, and supporting documentation. Overall, the report does not appear to contain details on a specific federal contract opportunity, but rather provides an assessment of the current condition of the Upper Pahranagat Cross Dike.
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Pahranagat National Wildlife Refuge
LINCOLN COUNTY, NV
UPPER PAHRANAGAT CROSS DIKE
LOW HAZARD POTENTIAL DAM
NATIONAL INVENTORY OF DAMS NO.
SEED INSPECTION REPORT
INSPECTION DATE: 01/23/1992
Submitted To: Prepared By:
U.S. Fish & Wildlife Service Other Infrastructure Management Division Dam Safety Program 5275 Leesburg Pike Tel:
Falls Church, VA 22041 Fax:
Tel: 703-358-2582
Inspected By (Name/Title):
Signature Date
Reviewed By (Name/Title):
Signature Date
UPPER PAHRANAGAT CROSS DIKE ()
Pahranagat National Wildlife Refuge
Inspection Date: 01/23/1992
TABLE OF CONTENTS
CHAPTER Page
1. Current Conclusions 1
2. Current Recommendations and Cost Summary 2
3. Status of Previous Recommendations 5
5. Pertinent Data 7
APPENDICES
A. Photos B. Figures, Maps and Plans C. Current Recommendations and Detailed Cost Data D. Supporting Documentation
1. CURRENT CONCLUSIONS
A.
B.
C.
1. Current Conclusions
Overall Safety Classification The overall safety classification of the dam is .
"The reason for this rating is listed below."
null
Screening Level Risk Assessment The Screening Level Risk Assessment (SLRA) system for evaluating dams used by the FWS is a modification of the Bureau of Reclamation's SLRA method. The numeric total from the semi-quantitative method is used to rank a given dam with respect to the dam's downstream consequences and potential failure modes (normal, hydrologic, and seismic). The ranking factor total is unlimited based on the number of potential failure modes, with higher numbers being a worse condition. The
SLRA factors are assigned by the SEED inspector according to his or her evaluation at the time of the current inspection. The numeric total is used by the FWS to set priorities for repairs, studies, analyses, construction, and other dam safety activities.
The total SLRA value for this dam assigned during the current inspection is .
Hazard Classification The dam is classified as a LOW HAZARD dam.
/ UPPER PAHRANAGAT CROSS DIKE 1
2. CURRENT RECOMMENDATIONS AND COST
SUMMARY
2. Current Recommendations and Cost Summary
Year of Estimate:
A. Emergency Situation
B. Maintenance
C. Operations and Monitoring
D. Construction
Recommendation(s) Cost None
Total Emergency Situation Recommendations 0 Total Emergency Situation Costs $0.00
Priority 1 Recommendation(s) Cost None
P1 Maintenance Recommendations 0 P1 Maintenance Costs $0.00
Priority 2 Recommendation(s) Cost None
P2 Maintenance Recommendations 0 P2 Maintenance Costs $0.00
Total Maintenance Costs $0.00
Priority 1 Recommendation(s) Cost None
P1 Operations and Monitoring Recommendations 0 P1 Operations and Monitoring Costs $0.00
Priority 2 Recommendation(s) Cost
1. Remove small brush and emerging trees from crest area. $0.00
2. Replace gravel surfacing that has eroded from crest. $0.00
P2 Operations and Monitoring Recommendations 2 P2 Operations and Monitoring Costs $0.00
Total Operations and Monitoring Costs $0.00
Priority 1 Recommendation(s) Cost None
P1 Construction Recommendations 0 P1 Construction Costs $0.00
Priority 2 Recommendation(s) Cost None
P2 Construction Recommendations 0
/ UPPER PAHRANAGAT CROSS DIKE 2
E. Additional Studies or Analyses
F. Future Inspections
Definitions
The U.S. Fish and Wildlife Service (FWS) has established the following categories to determine a priority ranking system for which work must be completed in order to maintain the integrity and operation adequacy of dam structures:
Emergency Situation - Structure is in danger of imminent failure and action must be taken immediately to alleviate the emergency.
P2 Construction Costs $0.00 Total Construction Costs $0.00
Priority 1 Recommendation(s) Cost None
P1 Additional Studies or Analyses Recommendations 0 P1 Additional Studies or Analyses Costs $0.00
Priority 2 Recommendation(s) Cost None
P2 Additional Studies or Analyses Recommendations 0 P2 Additional Studies or Analyses Costs $0.00
Total Additional Studies or Analyses Costs $0.00
Recommendation(s) Cost None
Total Future Inspections Recommendations 0 Total Future Inspections Costs $0.00
Total Emergency Recommendations 0 Total Emergency Costs $0.00
Total P1 Recommendations 0 Total P1 Costs $0.00
Total P2 Recommendations 2 Total P2 Costs $0.00
Total Future Inspection Recommendations 0 Total Future Inspection Costs $0.00
Total Recommendations 2 Total Costs $0.00
/ UPPER PAHRANAGAT CROSS DIKE 3
Priority 1 (P1) - Normal condition of the structure is impaired and the safety of the structure is in jeopardy.
Priority 2 (P2) - Conditions do not currently appear to threaten the safety of the dam. Continued deterioration and/or unusual loading may threaten the safety of the dam.
/ UPPER PAHRANAGAT CROSS DIKE 4
3. STATUS OF PREVIOUS
RECOMMENDATIONS
C.
1.
2.
D.
E.
3. Status of Previous Recommendations
Emergency Situation
None
Maintenance
PRIORITY 1 Recommendation(s)
None
PRIORITY 2 Recommendation(s)
None
Operations and Monitoring
PRIORITY 1 Recommendation(s)
None
PRIORITY 2 Recommendation(s) Recommendation: Remove small brush and emerging trees from crest area.
Total Cost:$0.00 Response:
Recommendation: Replace gravel surfacing that has eroded from crest.
Total Cost:$0.00 Response:
Construction
PRIORITY 1 Recommendation(s)
None
PRIORITY 2 Recommendation(s)
None
Additional Studies or Analyses
PRIORITY 1 Recommendation(s)
None
PRIORITY 2 Recommendation(s)
/ UPPER PAHRANAGAT CROSS DIKE 5
F. Future Inspections
/ UPPER PAHRANAGAT CROSS DIKE 6
4. SCREENING LEVEL RISK ASSESSMENT
5. PERTINENT DATA
5. Pertinent Data General
Dam Section(s)
1. Dam Name *: UPPER PAHRANAGAT CROSS DIKE
2. NID Number *:
3. Other Dam Name(s) *:
4. Dam Former Name(s) *:
5. Dam State *: NV
6. Dam County *: LINCOLN
7. Dam Latitude *: 37.3
8. Dam Longtitude *: -115.13
9. Legal Description (Section, Township, Range Location) *:
S34,T7S,R61E
10. River or Stream Name *: WHITE RIVER
11. Basin: COLORADO RIVER
12. Reservoir Name:
13. Year Constructed *: 1978
14. Year and Reason Dam Modified *:
15. Downstream Hazard Potential Classification *: LOW
16. Resource Value:
17. Inventory Status: Non-Inventory
18. Size Classification: SMALL OR MINOR
19. SAMMS#: 10005105
20. Confined Space:
21. Estimated Economic Losses Downstream:
Notes:
This structure is a cross-dike to Upper Pahranagat Dam. The state previously noted the structure as NV20144. It has been removed from the inventory.
Embankment Dam Section 1: UPPER PAHRANAGAT CROSS DIKE
1. Dam Type *: EARTH
2. Crest Elevation: 3,353.5 Ft.
3. Dam (Crest) Length *: 1,572 Ft.
4. Crest Width: 12 Ft.
5. Dam Height *: 11 Ft.
6. Structural Height *: 11.3 Ft.
7. Hydraulic Height *: 7.7 Ft.
8. Upstream Slope: H:1V
9. Downstream Slope: H:1V
10. Core Position *:
Type *:
Certainty *:
/ UPPER PAHRANAGAT CROSS DIKE 7
C.
D.
Saddle Dike(s)
Discharge Structure(s)
11. Foundation *:
Certainty *:
Karst:
12. Volume of Dam *: CY
There are no saddle dikes currently associated with this structure.
Discharge Structure 1:
1. Discharge Structure Type: Service Spillway
2. Description: (2) DROP INLET W/STOPLOGS
3. Location:
4. Approach Channel:
5. Intake Structure:
a. Crest Elevation: 3,350.5 Ft.
b. Invert Elevation: Ft.
c. Size: 0
d. Material:
e. Width: Ft.
6. Control Structure:
a. Type *: CONTROLLED
b. Min Control Elevation: Ft.
c. Max Elevation of Gate Opening: Ft.
d. Max Control Elevation: Ft.
e. Size:
f. Material:
7. Conveyance Structure:
a. Length: 0 Ft.
b. Size:
c. Inlet Invert Elevation: Ft.
d. Outlet Invert Elevation: Ft.
e. Year of Conduit Installation:
8. Outlet Structure:
a. Energy Dissipation:
9. Discharge Channel:
10. Discharge Capacity with Water Surface at *: cfs and is based on the following formula:
Discharge Structure 2: EARTHEN CHANNEL
1. Discharge Structure Type: Emergency Spillway
2. Description:
3. Location:
4. Approach Channel:
/ UPPER PAHRANAGAT CROSS DIKE 8
5. Intake Structure:
a. Crest Elevation: 3,349.9 Ft.
b. Invert Elevation: Ft.
c. Size: 50
d. Material:
e. Width: Ft.
6. Control Structure:
a. Type *:
b. Min Control Elevation: Ft.
c. Max Elevation of Gate Opening: Ft.
d. Max Control Elevation: Ft.
e. Size:
f. Material:
7. Conveyance Structure:
a. Length: Ft.
b. Size:
c. Inlet Invert Elevation: Ft.
d. Outlet Invert Elevation: Ft.
e. Year of Conduit Installation:
8. Outlet Structure:
a. Energy Dissipation:
9. Discharge Channel:
10. Discharge Capacity with Water Surface at *: cfs and is based on the following formula:
Discharge Structure 3:
1. Discharge Structure Type: Outlet Works
2. Description: N/A
3. Location:
4. Approach Channel:
5. Intake Structure:
a. Crest Elevation: Ft.
b. Invert Elevation: Ft.
c. Size:
d. Material:
e. Width: Ft.
6. Control Structure:
a. Type *:
b. Min Control Elevation: Ft.
c. Max Elevation of Gate Opening: Ft.
d. Max Control Elevation: Ft.
e. Size:
f. Material:
7. Conveyance Structure:
/ UPPER PAHRANAGAT CROSS DIKE 9
E.
F.
Reservoir / Flood Hydrology
Management
a. Length: Ft.
b. Size:
c. Inlet Invert Elevation: Ft.
d. Outlet Invert Elevation: 0 Ft.
e. Year of Conduit Installation:
8. Outlet Structure:
a. Energy Dissipation:
9. Discharge Channel:
10. Discharge Capacity with Water Surface at *: cfs and is based on the following formula:
Reservoir Storage Level Elevation (feet) Surface Area
(acres) Capacity (acre-feet)
Maximum Normal Pool * 3,350.5 112 357 Top of Dam * 3,353.5 172 913
Flood Hydrology
1. Inflow design flood: Unknown
2. Storm Duration: hours
3. Total Rainfall: inches
4. IDF Peak Inflow: 0 cfs
5. Storm Volume: acre-feet
6. Max. reservoir water surface elevation during the IDF:
Ft.
7. IDF Freeboard: Ft.
8. Depth of Overtopping:
Ft.
9. Duration of Overtopping:
hours.
10. IDF Peak Outflow: cfs
11. Drainage Area: 4,423 square miles
12. Drainage Basin Description *:
Notes:
null null
1. Owner Name *: US FISH AND WILDLIFE SERVICE
2. Owner Type *: FEDERAL
3. Dam Designer *:
4. Private Dam on Federal Property *:
5. Field Station: Pahranagat National Wildlife Refuge
6. Dam Purposes *:
7. Field Station Contact Information:
Name:
Address1: HIGHWAY 93 NORTH, MILEPOST 32 Address2: ALAMO, NV 89001 Phone: (775) 725-3417
8. Dam Safety Program Contact:
/ UPPER PAHRANAGAT CROSS DIKE 10
G.
H.
I.
EAP / SOP
Inspection Details
Pertinent Data Notes
* denotes data submitted to the NID.
Name: Zach Spruell Regional Dam Safety Officer, Region 8
Address: Region 1 7 8 Division of Engineering 911 NE 11th Avenue (3W) Portland, OR 97232
Phone: (503) 231-2396
9. Organization Code: 84551
10. Region: 8
11. Ecosystem: 06
12. Federal Agency Involvement in Design *:
13. Federal Agency Involvement in Construction *:
14. Federal Agency Involvement in Regulatory *:
15. Federal Agency Involvement in Inspection *:
16. Federal Agency Involvement in Operation *:
17. Federal Agency Owner *:
18. Federal Agency Involvement - Other *:
1. Emergency Action Plan (EAP): * not required
1. Date of Previous Inspection:
Inspection Type:
2. Date of Most Recent Inspection *: 01/23/1992 Inspection Type:
3. Inspection Frequency *: 5 Est. Date of Next Inspection: 01/23/1998
4. Inspected By (Primary):
Inspected By (Secondary):
5. Reviewed By:
6. Prepared By: US FISH AND WILDLIFE, M. FOX
7. Date of Most Recent Internal Inspection:
/ UPPER PAHRANAGAT CROSS DIKE 11
6. INSPECTION CHECKLIST
A. PHOTOS
No photos available.
/ UPPER PAHRANAGAT CROSS DIKE A-1
B. FIGURES, MAPS, AND PLANS
THIS SECTION DOES NOT CONTAIN ANY DOCUMENTS.
C. CURRENT RECOMMENDATIONS AND
DETAILED COST DATA
Operations and Monitoring Priority 2 Recommendation 1
Recommendation:
Remove small brush and emerging trees from crest area.
Detailed Cost Data:
Cost Summary:
Year of Original Recommendation:
Category Description Rate Unit # Units Total
a. Labor $0.00 g. City Cost Index % $0.00
b. Equipment $0.00 h. Federal Contracting Remote Site % $0.00
c. Materials $0.00 i. Contingency % $0.00
d. Engineering $0.00 j. Total $0.00
e. Other $0.00
f. Subtotal $0.00
/ UPPER PAHRANAGAT CROSS DIKE C-1
Operations and Monitoring Priority 2 Recommendation 2
Recommendation:
Replace gravel surfacing that has eroded from crest.
Detailed Cost Data:
Cost Summary:
Year of Original Recommendation:
Category Description Rate Unit # Units Total
a. Labor $0.00 g. City Cost Index % $0.00
b. Equipment $0.00 h. Federal Contracting Remote Site % $0.00
c. Materials $0.00 i. Contingency % $0.00
d. Engineering $0.00 j. Total $0.00
e. Other $0.00
f. Subtotal $0.00
/ UPPER PAHRANAGAT CROSS DIKE C-2
D. SUPPORTING DOCUMENTATION
THIS SECTION DOES NOT CONTAIN ANY DOCUMENTS.
File details come from the government source that posted it. Updated .