Mt. Charleston Recovery Meeting
October 11, 2023
Area 1 - Mary Jane Falls Trailhead
Debris at trailhead sign and restroom
Forestry service states the trail and trailhead are inoperable without cleanup efforts
Rock debris deposited in flow path. 2019 OA MPU shows contributing watersheds converge at bottom of canyon with 100-year flow rate of 5638 cfs.
Tree debris swept in the flow path
Looking downstream from trail area (southwest of trailhead)
Debris and tree-fall causing damage to the restroom roof
Rip-rap along SNWA well site (repair needed)
Channel flow path downstream of trailhead parking area
Area 2 - Echo Road
K-Rails put along roadway to maintain flow path on forest side. Berm washed out leading to destruction of paved road and impacting residents on north side of Echo Rd
Material put back along Echo Rd, but recommend compaction and engineered solution to avoid washout in future rain events
CCPW has 30-ft ROW and only 20-ft pavement. Majority, if not all, of existing berm on forestry land. Recommend berm integrity to maintain flow path on intended forest side and not on Echo Rd
Spring flows from the north conveyed through headwall and culvert under Echo Rd to get it back to southern forest side to protect Echo Rd
Standing on forest side, adjacent to Echo Rd, significant erosion along flow path. Dirt material placed back along Echo Rd but would need long term solution to protect roadway and housing along Echo Rd
Another look at erosion along flow path
Erosion on housing side along Echo Rd (note this is post cleanup of significant debris on Echo Rd)
No separation from Echo Rd and forest flow path near housing, recommend berm to direct and maintain flows on forest side to protect life and property along Echo Rd.
Area 3 - NDOT Bridge
NDOT completed post rain event grouted rip-rap along bridge abutments and added new armoring along Echo Rd side (due to flows on Echo Rd from berm failure)
Looking upstream from NDOT Bridge, note new grouted rip-rap armoring on side slopes
NDOT mentioned no engineering plans in emergency fix: just eye-ball and match grading. Maybe be able to excavate further if grading allows to get more capacity
NDOT Bridge B-609, some damage to abutment was repaired
Area 4 - Mt. Charleston Library
Newly graded channel upstream of the culvert at the CC Library. Small loose rip-rap likely to be washed out in larger rain events and clog CC library culvert
Looking downstream to culvert at CC Library, unlikely to have capacity for 100-year event from the 2019 OA MPU. Loose rip-rap likely to cause clogging issues in future rain events. Note: Post rain event had debris above railing
Downstream of culvert at CC Library. Significant erosion. Note: During the rain event, flow path bisected the CC Library and swept through Old Town through this channel and on Aspen Rd
Another look upstream from the culvert at the CC library
Area 5 - Old Town and Lundy ES
Flow path bisected the CC Library and swept through Old Town.
Finished grade on Aspen Road washed out approximately 3-ft from rain event
Another look at washed out Aspen Rd
Flow path in channel behind Mahogany Drive at the back of houses
Close-up of channel behind houses on Mahogany Drive
Culvert in Old Town with significant debris. Clogging and lack of capacity during rain event caused erosion as flows swept through Old Town
Looking downstream at the Old Town culvert
Pedestrian bridge (connection washed out) just before Lundy ES
Pedestrian bridge culvert, storm flow path was to the south and washed out the path into the forest
Looking upstream from the pedestrian bridge
Looking upstream at washed out area beyond the pedestrian bridge culvert
Lundy ES, significant amount of material and large rock was brought back to fill in the erosion
30 trucks of concrete was brought in and pumped into the ground to stabilize Lundy ES
Lundy ES post event and post recovery comparison. Significant material brought back to fill in erosion
Area 6 - Existing MPU Crossing
Rainbow Canyon RCB washed out by rain event
Looking towards street sign from washed out 8'x4' RCB. MPU shows 7441 cfs in 100-year and to be replaced with ultimate facility of 105'W x 4.5'D bridge crossing
Looking downstream from washed out RCB
Close-up of washed out RCB. Recommend replace in-kind when CCPW is ready with MWP funding from CCRFCD,
Another view downstream from washed out RCB
Tire at washed out RCB location
Robust tree at washed out RCB location
