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“Concrete Nurse Logs: Spawning Biodiversity from Ballard’s Century-Old Locks” is Hillary Pritchett’s conceptual landscape-architecture proposal for making the Ballard Locks fishway more hospitable to salmon and other forms of biodiversity. Its central idea is a phased transition—a longer gradient of salinity, temperature, and elevation—rather than an abrupt engineered divide. The project received a 2017 American Society of Landscape Architects Student Awards Honor Award in General Design, but the cited sources do not establish that it was built or adopted. The proposal combines a redesigned fishway with an education center and treats the existing locks complex as a metaphorical “nurse log”: infrastructure that can support ecological change over time.
What is Concrete Nurse Logs from Ballard?
Concrete Nurse Logs is a student design study by Hillary Pritchett, Associate ASLA, associated with the University of Washington. The American Society of Landscape Architects (ASLA) recognized it with a 2017 Student Awards Honor Award in General Design; the University of Washington’s landscape-architecture listing corroborates the award. The ASLA project page presents the project narrative and drawings, while the University of Washington listing records the school’s connection to the award.
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The title refers to the Hiram M. Chittenden Locks, commonly called the Ballard Locks, at the Lake Washington Ship Canal. In Pritchett’s narrative, the locks are a human-engineered divide between saltwater Puget Sound and the freshwater lakes east of the complex. The proposal asks whether that rigid separation could become the starting point for a more gradual ecological transition.
That distinction matters for anyone reading the project from a construction or infrastructure perspective. This is not documentation of a completed fishway, an operating estuary, or a confirmed alteration to the locks. It is an award-winning design proposal that uses landscape architecture to explore how navigation, water control, salmon passage, public education, and long-term ecological change might be addressed together.
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How could the Ballard Locks support salmon and more biodiversity?
According to the project narrative, the locks’ sharp separation of water conditions and elevations creates difficulties for salmon migration. Pritchett’s response is to extend the transition among salinity, temperature, and elevation through a phased fishway. Instead of asking fish to negotiate only a hard boundary, the design imagines a sequence of changing conditions.
The proposal’s key sentence is worth quoting because it describes the design logic directly: “In response to what I learned during the consultations with scientists, the design, a phasing strategy, is a metaphorical nurse log, a gradient between water temperature, salinity, and elevation.” The narrative reports consultations with scientists, but the cited material does not provide a separately named scientist’s quotation or an independent engineering assessment. The diagnosis and solution should therefore be attributed to Pritchett’s project narrative.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesIn practical design terms, a gradient can do several things at once:
- Provide a more continuous passage. A fishway organized around changing conditions could reduce the conceptual jump between marine and lake environments.
- Create varied habitat. Different combinations of salinity, temperature, depth, and elevation could support different organisms and life stages rather than a single uniform channel.
- Allow change over time. A phased strategy can begin with an intervention that works alongside existing infrastructure, then accommodate later ecological or hydrologic shifts.
- Make ecological processes visible. A public route and education center could explain why the water conditions change and how the locks shape those changes.
These are design intentions, not measured performance results. The sources do not report fish counts, passage rates, habitat monitoring, construction costs, or a completed installation.
What does “nurse log” mean in this proposal?
Here, “nurse log” is a metaphor for infrastructure that supports new life while it gradually changes itself. In a forest, a fallen log can become a substrate for mosses, fungi, seedlings, and invertebrates. Pritchett applies that generative idea to the century-old locks complex: rather than treating the concrete and gates only as obstacles, the design study imagines them as a framework from which a more diverse set of water and habitat conditions could develop.
The metaphor does not mean that the project proposed placing literal logs throughout the locks or replacing the lock system with a natural stream. It describes a relationship between an old engineered structure and a phased ecological transformation. The concrete remains the starting condition; the “nursing” is the way design, water movement, habitat, and public use could support a different future.
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For construction professionals, this is a useful shift in the question. The issue is not simply how to build a new object, but how to sequence interventions so that an existing, highly consequential facility can continue to perform essential functions while new ecological relationships are introduced.
Why are salinity, temperature, and elevation central to the design?
The project is organized around three linked gradients. Salinity distinguishes the saltwater side of the locks from the freshwater lakes. Temperature changes with the water sources, season, depth, and exchange between them. Elevation reflects the difference between the marine tide level and the lake level maintained east of the locks. Pritchett’s proposal treats these variables as a connected spatial experience rather than isolated technical measurements.
The ASLA project narrative states that the mean higher high water to mean lower low water range west of the locks is roughly 11.3 feet. It places the lake levels east of the locks at about 20 to 22 feet above mean lower low water, and describes a possible 22-foot water-level difference at summer low tide when lake levels are high. Those are figures presented by the project narrative, not measurements independently verified in the cited research. They are best used to understand why a gradual transition is such a consequential design problem.
A long gradient would not remove those differences. Rather, it would distribute the transition through a designed sequence. The proposal’s intellectual move is from “barrier versus no barrier” to “how much transition can be created, where can it occur, and how can it be phased?” That framing leaves room for continued navigation and water management while making ecological continuity a primary design objective.
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What would the proposed fishway and education center do?
The fishway is the proposal’s principal ecological intervention. It is presented as a redesigned route through which salmon could encounter a more extended set of water conditions. The education center adds a public and interpretive layer, allowing visitors to understand the relationship among the locks, the canal, the marine environment, the freshwater lakes, and the proposed gradient.
Combining passage with education is significant because the project is not only a hydraulic diagram. It is also a public-realm proposal. Visitors would be asked to see the locks as a changing ecological threshold rather than a fixed line between two bodies of water. The narrative therefore links biodiversity to access, interpretation, and civic understanding.
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The sources describe both the fishway and the education center as proposed design elements. They do not establish that either facility was constructed, opened to visitors, or integrated into the existing locks operations. Any current description should preserve that status.
How does a phased strategy work when the locks must keep operating?
Pritchett’s proposal does not present a conventional construction schedule with bid packages, dates, or cost estimates. “Phasing” is the project’s organizing strategy: ecological and spatial change happens incrementally instead of through a single all-or-nothing reconstruction. The following sequence explains the logic of the proposal without treating it as an approved scope of work.
- Start with the existing engineered divide. The locks, gates, canal edges, and established water-management functions remain the inherited condition. The design treats that concrete framework as a resource as well as a constraint.
- Introduce a fish passage aligned with gradients. A proposed fishway would extend the transition among elevation, temperature, and salinity rather than concentrating the change at one threshold.
- Let ecological and public programs reinforce one another. Habitat-oriented spaces and an education center could make the changing conditions legible to visitors while supporting the project’s biodiversity goal.
- Plan for longer-term transformation. The narrative connects the phased approach to sea-level rise and to a possible future in which the locks’ relationship with the estuary changes. That is a scenario in the design study, not a confirmed plan to breach the gates.
A real construction program would need substantially more information than the award pages provide: hydraulic modeling, structural analysis, navigation requirements, fish-passage criteria, water-quality review, permits, property and operations coordination, and a funded implementation strategy. None of those project-delivery details is established by the cited sources.
What does the proposal say about sea-level rise and a future estuary?
Sea-level rise appears in the project as a long-term design condition. Pritchett’s narrative considers how the locks might eventually transform as the relationship between Puget Sound and the freshwater lakes changes. The proposal uses that horizon to test whether a phased landscape could prepare for a different estuarine condition.
Readers should not convert that scenario into a report of present conditions. The cited material does not say that the Ballard Locks have been breached, that the miter gates have been removed, or that a new estuary exists at the site. “Future estuary” describes the proposal’s design imagination and its response to anticipated change, not a completed project outcome.
This distinction is especially important in construction coverage. A conceptual section drawing can show a possible sequence of transformation, but it does not establish authorization, engineering feasibility, environmental compliance, or a construction start date. Those would require separate documentation.
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What can construction and infrastructure teams learn from the design study?
Concrete Nurse Logs is valuable less as a ready-to-build specification than as a framework for thinking about infrastructure with a long service life. Several lessons transfer to other waterfront and civil projects.
Design the transition, not only the endpoint
Projects often define two target conditions—before and after—and focus on the structure that connects them. This proposal makes the connection itself the main subject. For a contractor or owner, that can prompt earlier coordination among grading, drainage, water-quality, habitat, access, and interpretation.
Use phasing to manage uncertainty
When climate, water levels, or ecological responses are uncertain, a phased concept can preserve options. It can also expose dependencies: which work must precede another, which elements can be monitored, and which existing functions cannot be interrupted. The proposal does not supply those construction controls, but it demonstrates why they belong in the design conversation.
Treat infrastructure as an ecological asset where possible
The nurse-log metaphor challenges the assumption that concrete has only a negative ecological role. It asks whether edges, channels, walls, and circulation routes can be detailed to support habitat and learning while retaining their structural or operational purpose. That is a question for site-specific engineering, not a universal claim that every barrier can be repurposed.
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The education center indicates that the project measures success partly through understanding. Clear public circulation, views into the fishway, and interpretation can help explain why water levels differ and why a phased intervention is necessary. Those elements would need to be coordinated with safety, maintenance, accessibility, and security requirements in any real project.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Was Concrete Nurse Logs ever built?
The available ASLA and University of Washington pages establish authorship, award recognition, and conceptual content, but they do not establish implementation. They do not say that the fishway or education center was constructed, that the locks were modified according to the proposal, or that a later agency project superseded it. Implementation status therefore remains unresolved in the cited material.
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The safest description is “award-winning student proposal” or “conceptual design study.” Calling it an operating project, a completed restoration, or an approved Ballard Locks redevelopment would go beyond the evidence.
How should readers evaluate the proposal’s ideas?
Because the sources describe one proposal rather than competing built alternatives, there is no evidence-based ranking of design options. Readers can nevertheless examine the concept through five useful questions:
- Continuity: Does the proposed sequence create a meaningful transition in water conditions, or merely add a new channel beside the existing divide?
- Fish passage: How would the route function across the stated elevation and water-quality differences, and what evidence would demonstrate success?
- Biodiversity: Which organisms and habitat types are intended to benefit, and how would seasonal changes be accommodated?
- Public use: Can education and access be provided without compromising navigation, maintenance, worker safety, or security?
- Adaptability: Can the project be expanded, altered, or monitored as sea levels and ecological conditions change?
Those questions do not prove that the proposal would work. They identify the studies and decisions a future implementation team would have to undertake before moving from a compelling design narrative to construction documents.
What is the bottom line on Concrete Nurse Logs?
Concrete Nurse Logs presents the Ballard Locks as an infrastructure barrier that might also become a platform for ecological transition. Hillary Pritchett’s award-winning student proposal centers on a phased fishway, a public education component, and a longer gradient among salinity, temperature, and elevation. Its references to sea-level rise and a possible future estuary expand the time horizon beyond a single construction project.
Its status is conceptual. The cited sources support the proposal’s authorship, award, design intentions, and narrative figures, but they do not confirm construction or current operation. The project’s lasting contribution is therefore a design question: how can a working water-control and navigation system be adapted over time so that salmon passage, biodiversity, and public understanding are treated as essential parts of the infrastructure brief?
Frequently Asked Questions
Is Concrete Nurse Logs a completed Ballard Locks project?
The cited sources identify it as Hillary Pritchett’s 2017 student design proposal and do not document construction. They also do not establish whether a later agency or campus project adopted or replaced the concept, so its implementation status cannot be confirmed from those pages.
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The American Society of Landscape Architects hosts the project page and narrative at ASLA’s 2017 Student Awards entry. The University of Washington records the award in its landscape-architecture portfolio at the department’s 2017 ASLA Awards listing.
Are the water-level numbers in the proposal official engineering measurements?
They are figures presented in Pritchett’s ASLA-hosted project narrative, including the stated 11.3-foot tidal range and the approximately 20-to-22-foot lake elevation above MLLW. The cited research does not independently verify the measurements or their datum, so they should be treated as project context rather than current design specifications.
Could the nurse-log idea be used on another waterfront project?
The metaphor can help teams think about phased ecological adaptation around existing infrastructure, but it is not a standard construction method. Applying it elsewhere would require site-specific hydraulic, structural, habitat, operational, permitting, and maintenance analysis rather than copying the Ballard concept.
