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Riverbend Engineering
River Restoration Enginered for Sustainable SolutionsRed River in Questa 16 Aug 2018, 4:47 pm
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Protected: Red River in Questa, NM — NMDGF 9 Aug 2018, 7:33 pm
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Santa Fe River in Santa Fe, NM — City of Santa Fe 8 Nov 2017, 8:27 pm
Cross Vane Repair
Riverbend Engineering teamed with another consulting firm on the design and construction oversight of this project for the City of Santa Fe. Recent flood events had torn apart a cross vane structure at a sharp bend in the river, and lateral riverbank erosion had begun. Riverbend’s design solution included armoring the outside bank of the river at the bend, widening the active channel to match the river upstream and downstream, and constructing several grade control structures to limit further channel bed erosion. Riverbend’s design sought to fix the erosion and grade control problems with a natural looking approach, and limited the hardscape to only those areas where it was necessary. The design palette utilized large boulders where needed, concrete grout for the largest grade control, willow and cottonwood transplants, and selected grading to shape the channel’s width and profile. The photo below shows the largest of the grade control structures during the construction process. As the vegetation matures, a mix of rocks and willows along the river bank looks much more natural than a continuous lining of concrete or riprap rock.
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Navajo River near Dulce, NM–Jicarilla Apache Game & Fish 4 Apr 2017, 10:38 pm
Endangered Fish Habitat & Municipal Water Supply Diversion
This project spanned over 4 years and included a river assessment of ~9 miles for possible fish habitat improvements for species of concern, Roundtail chub (Gila robusta) on the Navajo River above Dulce, NM. That assessment has led so far to ~5 miles of river restoration projects, and reconstruction of the main diversion dam for the potable water supply for the town.
To ensure an adequate diversion of water for the community, the existing dam (piled up river gravel and large rocks) required annual maintenance efforts. The old dam also created a fish passage barrier, impeding the Nation’s efforts at recovery of the Chub. The Nation initially considered a much more expensive concept plan for a concrete structure. In the end the diversion was constructed with large boulders and a series of step-pool weirs extending downstream. Native riparian transplants ensured high function and aesthetics as well as reduced annual maintenance costs. This alternative design provides for natural fish passage and minimizes maintenance time and costs significantly.
Riverbend’s services to the Nation included surveying, hydrologic and hydraulic calculations, preliminary and final designs, construction cost estimates, confirmation of 404 & 401 permit exemptions, project specifications and bid documents. In the implementation phase of the irrigation dam modification project Riverbend was hired as the general contractor, and had construction management personnel onsite each day during construction.
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Rio Mimbres in Mimbres, NM – NMDGF 31 Mar 2017, 8:47 pm
River Restoration for Endangered Species
PHASE I: Mimbres Wildlife Area
This mile-long section of the Rio Mimbres has been owned by the New Mexico Department of Game & Fish (NMDGF) for several decades. This reach is managed for conservation of the endangered Chihuahua Chub fish (Gila nigrescens) and the listed Chiricahua leopard frog (Lithobates chiricahuensis)–public access is limited and fishing is not allowed. A forest fire in 2006 in the Black Range had left the upper reaches of the Rio Mimbres watershed devastated. Subsequently there have been several very large flow events that originated on burn-scar areas. Sediment deposition and woody debris accumulations from these fire accentuated runoff events had made habitat conditions that were already poor even worse. The river restoration design for this project paid special attention to the specific habitat needs of both endangered species, and preserved the status of the very healthy existing riparian vegetation.
PHASE II: Mimbres River Preserve, The Nature Conservancy
(more information coming soon)
Riverbend’s services to NMDGF for both these projects included surveying, hydrologic and hydraulic calculations, preliminary and final designs, construction cost estimates, project specifications, and bid documents. In the implementation phase of the project Riverbend provided construction oversight. To mimic natural habitat features where sustainable populations of the Chub are currently found, design relied heavily on woody debris type structures and localized scour pools. Habitat for the frog was created by enhancing natural wetland depressions, and with new off channel ponds that are hydraulically connected to the river.
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Santa Fe River near Santa Fe, NM–Santa Fe County 11 Aug 2015, 8:38 pm
Riverbend has worked with Santa Fe County since 2011. Our first project with the County included design, permitting and construction management of wetland improvements, trail and parking access improvements at Arroyo Hondo Open Space. Between 2012 and 2014 Riverbend worked on the design and construction oversight of three separate river restoration projects in the Santa Fe River. On several of these projects Riverbend was a design sub-consultant to a larger firm, but on the most recent flood damage repair project Riverbend was the prime contractor with the County. Through these multiple projects Riverbend has established a strong working relationship with County staff, even as other involved consultants have come and gone. This relationship and confidence in Riverbend’s technical abilities has led to Riverbend being selected for on-call services with the County, and the subsequent solicitation of cost proposals for engineering services at other locations within the County, see below.
Santa Fe River Trail and Channel Improvements, Phase 4
Riverbend developed revised grade control structure concepts due to difficulties experienced during Phase 3 construction in obtaining adequate quantities of large boulders. Soil cement was ultimately decided upon.
Santa Fe River Restoration at San Ysidro River Park in Agua Fria, NM
Riverbend Engineering was hired as a river expert for this river restoration and stormwater management project. Approximately two years after the initial prototype restoration work was completed along the Santa Fe River between the San Ysidro crossing and Caja del Oro Grant Road, an estimated 100-year storm caused damage to several sections of the newly reconstructed riverbed. To address those areas, Riverbend designed repairs and/or modifications to some of the previous work, plus new improvements including additional grade control structures, bank erosion protection structures, riparian plantings, and additional stormwater rundowns at the river. Following completion of the design, Santa Fe County hired Riverbend directly to oversee construction of the repair work in this section of the river. Due to their river expertise and success on this and other similar projects, Riverbend is now included on the County’s list of pre-qualified consultants.
Santa Fe River at the Randall Davey Audubon Center
Riverbend Engineering provided technical expertise for river restoration design in the upper reaches of the Santa Fe River adjacent to the Audubon Center. The riparian vegetation enhancement project extended from the old Two-Mile Dam site to the Acequia Madre headgate, and included mapping, inventory and designation of surviving riparian habitat, as well as restoration of degraded areas. Riverbend developed the primary designs for both the river restoration work and a flow diversion structure that was included in the final plan set. Riverbend also provided construction phase support.
Arroyo Hondo Open Space
Our first project with the County included design, permitting and construction management of wetland improvements, trail and parking access improvements at Arroyo Hondo Open Space.
Frenchies Field & Siler Road
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White Salmon River at Condit Dam, WA 4 Jun 2015, 11:12 pm
In south central Washington, ~ 3 river miles upstream from Columbia River confluence, near WA/ OR border Riverbend was hired (by J.R. Merit, Inc. Dam Removal General Contractor who was hired by PacifiCorp) to oversee the general contractor’s implementation of the environmental restoration aspects of this project. Riverbend was directly responsible for the evaluation and design of restoration features in the White Salmon River and its on-site tributaries, design of woody debris structures in the river, design of riparian area restoration, grading and stabilization of sediments left behind in the former reservoir. Riverbend’s subcontractors took care of all the water quality monitoring, and all the aerial photography and LiDAR mapping. Riverbend provided consulting engineering support for many other smaller tasks over the project’s duration, from designing a bypass water pipeline, to evaluating the stability of relic bridge structures in the river, exposed by the elimination of the reservoir. Condit Dam is the largest concrete dam to be removed in the US for environmental reasons. The dam removal was featured in Patagonia’s Dam Nation movie released spring 2014 (and edited from Ben Knight’s office in Telluride) Riverbend Engineering’s staff was on-site in full force for the for the epic explosive dam removal in October of 2012.
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Stollsteimer Creek near Chimney Rock, CO 4 Jun 2015, 11:04 pm
Channel incision and bank erosion had led to poor water quality conditions and a lack of riparian vegetation. This valley area on the Southern Ute Tribe provides winter habitat for elk and a perennial water source for many mammals. The design solution included grading of point bars and low floodplains where feasible, preventing bank erosion with toe rock and construction of a floodplain bench behind the rock. Riverbend’s geomorphic analysis aided in the design of a low flow system inset within a larger channel & floodplain form capable of passing the 5 year event.
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Uncompahgre River in Ridgway, CO 4 Jun 2015, 10:44 pm
This project included complete river restoration, addressing decades of in-stream gravel mining. Restoration work included grading of a stable single thread channel, bank stabilization with large woody debris and large boulders, grade control and fish habitat structures, construction of multiple wetlands (open water and shallow depression types), and construction of two whitewater wave features. A new pedestrian trail was designed, extending from an existing Town park all the way north through the restored river section. The restoration work terminates at the north end at an historic railroad bridge. The design had to accommodate a new pedestrian bridge, an existing CDOT bridge, an existing sanitary sewer crossing the river, fish passage throughout, nesting bald eagle habitat, and a very high sediment load from the upstream watershed. Analysis and documentation of changes to the regulatory floodplain were prepared for FEMA map revisions. Aerial photo “Before” shows highly braided river system after in-stream gravel mining in the 1970s through 1990s. Low angle aerial image “After” shows the restored river with open water wetlands in right foreground, depression wetlands (dark brown areas) further downriver, a CDOT bridge and two whitewater wave features in the foreground. Bald eagle habitat is protected on river-right in the downstream (background) part of the project.
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Santa Clara Main Irrigation Ditch on Santa Clara Pueblo, NM 4 Jun 2015, 10:43 pm
The project worked around culturally sensitive areas and multiple tribal member allotments. Riverbend completed an assessment, survey, preliminary design, and detailed cost estimates for all 11 miles of irrigation ditches at Santa Clara Pueblo. This included two diversion headgate structures on the Rio Grande, and the existing diversion concrete dam & sediment weir system in the canyon where irrigation water is diverted into a pipeline. Problems ranged from poorly functioning siphons, to road crossings, and limited hydraulic capacity to deliver water to certain fields. Riverbend staff worked closely with pueblo staff to catalog problems with the existing irrigation water delivery system. This work enabled the Pueblo request funding from the U.S. Congress. In 2013 the Pueblo was granted Funds for the first phase of ditch replacement work. The priority reach was the Main Ditch, from Santa Creek downstream for approximately 1.5 miles (with 24 separate diversion points). Riverbend prepared final construction drawings, specifications and construction cost estimates, and was retained to provide construction inspection during the implementation phase. The final result of the main ditch replacement project is a functional new concrete lined ditch, which meets the hydraulic requirements of the Pueblo water users.
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