# Pool or spa permit WET2025-00009 at 4886 Table Mesa Dr, Boulder Boulder Planning and Development Services permit WET2025-00009: issued May 15, 2026 for pool or spa work at 4886 Table Mesa Dr. The project components include an earthen embankment dam, a structural spillway wall along U.S. 36, a detention excavation area, an outlet works structure, grading, South Loop Drive reconstruction, and other improvements to address project mitigation requirements. The full design set has been submitted in the City permit application documentation. The earthen embankment would be located in the northern portion of the CU Boulder South Campus and would consist of a homogeneous earth fill embankment with internal filters and drains, with slopes constructed at 4 horizontal to 1 vertical. The embankment crest would be 17 feet wide. The alignment of the earthen embankment requires that South Loop Drive to be reconstructed to extend above the earthen embankment. A barrier wall would be constructed below the embankment dam to manage seepage through the foundation soils when the reservoir is storing water, and it will consist of a soil-bentonite barrier wall below the centerline of the embankment dam alignment. The barrier wall will connect to the embankment dam fill and extend into the underlying bedrock to provide a continuous, low-permeable seepage barrier along the dam alignment. A structural spillway would be constructed along U.S. 36 and connect to the U.S. 36 earth fill embankment at the east end and the earthen embankment at the west end. The spillway would consist of a reinforced concrete wall supported by concrete secant piles. The secant piles would provide structural support and below-ground seepage control. Seepage control would prevent excessive seepage through the spillway foundation when the reservoir stores water. A reinforced concrete apron will be constructed on the downstream side of the spillway to dissipate energy and reduce the likelihood of erosion from overtopping flows. Spillway flows would be discharged from the concrete apron to the U.S. 36 roadside ditch and will eventually overtop U.S. 36 during flood events exceeding the 100-year event. Currently, U.S. 36 is overtopped by flood events more frequently than the 100-year event. A groundwater conveyance system would be installed along the spillway wall to allow normal groundwater flows to pass through the secant piles. The groundwater conveyance system will consist of facilities for collecting, conveying, and distributing groundwater. In addition to the detention storage provided by the embankment and spillway, detention storage is also required below the existing ground, which would be achieved by excavation. The detention excavation would be located immediately south of the earthen embankment dam. Excavated materials from the detention storage would likely be used in constructing the earthen embankment. Since the excavation would be below existing groundwater elevations, a barrier wall would be constructed to keep the excavation from filling with groundwater, rendering it ineffective for detention storage. The barrier wall would be similar to the barrier wall described above for the earthen embankment but would extend around the perimeter of the detention excavation and connect into the barrier wall under the embankment. An inflow rundown channel would be constructed along the northeast side of the excavation to convey overtopping flood flows from SBC into the detention excavation. Since the lower portion of the reservoir pool would not freely drain back to SBC, an outlet works pipe would be required to meet SEO dam safety requirements and to allow the entire reservoir to be drained to meet water rights requirements. The outlet works pipe would extend from the detention excavation on the CU Boulder South Campus to Viele Channel north of U.S. 36. This would require approximately 250 feet of tunneling below U.S. 36. The invert of the outlet works would be 5,343 feet in elevation, and the outlet works pipe is sized to achieve the goals of the flood project and to drain the reservoir in 120 hours and to prevent the detention area from filling at the beginning of the flood while not increasing downstream flooding. To satisfy regional detention mitigation needs and enhance the area's ecological conditions, the city will restore (re-establish or rehabilitate) wetlands and restore, establish, and enhance threatened and endangered species (T&E) resources in the project area. Reestablishment or rehabilitation restores natural and historical functions to a former or degraded resource. The creation of existing species? habitats occurs through establishing suitable habitats. Enhancing existing species' habitat occurs through planting desired species and removing noxious plant species. Additionally, before initial ground disturbance in ULTO habitat areas along the spillway wall, floodplain sod will be salvaged and transplanted in mitigation enhancement areas according to recommended practices. While ecological restoration efforts aim to restore or enhance natural functions, it is understood that ecological restoration is a long-term process, and it is not possible to fully restore and duplicate intact floodplain soils and plant communities. - Permit number: WET2025-00009 - Issued: May 15, 2026 - Type of work: Pool or spa (city: Wetland Permit, Public Process) - Status: Issued (city: Issued) - Reported cost: Not listed - ZIP code: 80305 - All permits at this address: https://nearbypermits.com/boulder/address/4886-table-mesa-dr/ --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-09 23:53 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ Every permit at 4886 Table Mesa Dr: https://nearbypermits.com/boulder/address/4886-table-mesa-dr/