Blenheim Blvd Multimodal Improvements

Project description

The project proposes multimodal improvements along Blenheim Boulevard. Proposed corridor facilities include a two-way cycle track, sidewalks, upgraded bus stops, separated bicycle lanes, upgraded pedestrian and transit amenities, improved landscaping and buffering, roundabouts at select locations, left turn pockets, and additional turn lanes. The project's corridor geometry was resolved at confirmation via street name to approximately 7,284 feet. Project status is listed as unknown in the source record.

Two city documents describe the project under slightly different names and with a notable difference in scope: the city project directory record refers to the project as "Blenheim Blvd Multimodal Improvements" and lists "additional turn lanes" among the corridor facilities, while the project FAQ document (titled "Old Lee Highway FAQs") states that the plan does not include additional roadway lanes or a continuous center turn lane, and that only turn pockets and roundabouts at select locations are included. These descriptions have not been reconciled in this analysis; readers should consult the project documents directly.

A staff report published in the April 28, 2026 Council packet (Agenda Item #9a) reports a construction cost of $21,770,570 and a total project cost (including all phases) of $30.4 million. These are external estimates published by city staff and are reported here as attributed; they are not figures produced by this analysis.

No existing parcel data, assessed value, square footage, or unit counts were available for this project. Corridor length, acreage, and all proposed building-scale quantities carry low extraction confidence.

Bike-lane corridor effects

The bike-lane module estimates the population newly served by the corridor using a decay-weighted catchment: Census 2020 block populations are weighted by an exponential decay function (exp(−beta_bike × bike travel minutes to the corridor)), computed via multi-source Dijkstra routing across 81 corridor nodes on the OpenStreetMap bike network. At the central decay parameter (beta_bike = 0.10 per minute, with a range of 0.05–0.15, calibrated to Iacono, Krizek & El-Geneidy (MnDOT 2008-11)), this yields a decay-weighted catchment of approximately 42,000 residents, with a range of 24,000–84,000 reflecting uncertainty in the decay rate.

Induced daily bike visits to corridor businesses are estimated by multiplying the catchment population by a latent bike-trip rate per resident per day (central: 0.035, range: 0.02–0.05, derived from FHWA 2020 NHTS data) and an induced corridor visit share (central: 0.10, range: 0.03–0.20). The induced visit share represents the fraction of catchment residents' latent daily bike trips that newly end at corridor businesses because the facility exists, combining induced cycling and route shift. Its bounds are calibrated to observed corridor natural experiments, including Liu & Shi (2020, NITC) findings across 14 corridors in 6 cities and Volker & Handy (2021, Transport Reviews) across 23 studies. The central estimate is 149 induced bike visits per day, with a range of 15–842.

New annual spending at corridor businesses is computed by multiplying induced daily bike visits by the corridor establishment-group mix (based on POI count shares), by cyclist spend per trip, and by 365 days. Spend per trip for other retail is drawn from Clifton et al. (2013, PSU/NITC), with a central value of $10 per trip and a range of $5–$20. The headline new annual spending estimate is approximately $540,000 (range: $27,000–$6,100,000).

The analysis identified three corridor establishments by name, each allocated an equal share of the other retail spending pool given equal POI count weighting: Historic Blenheim, Fairfax Surf Shop / 360Ride Skateboard Camp, and Nia with Cami St.Germain. Each is estimated to capture approximately $181,000 per year in new cyclist spending (range: $8,900–$2,048,000).

A diagnostic implied sales uplift — computed as new corridor spending divided by a rough baseline of corridor business sales — yields a central fraction of 0.23 (range: 0.01–2.56). The upper end of this range exceeds the envelope of observed natural experiments (roughly 0–50% sales or employment gains in the corridor literature), which signals that the high-end scenario should be treated with particular caution.

These are screening estimates. The induced-share bounds are calibrated to corridor before/after studies, and the figures rank plausible magnitudes with sensitivity bounds — they are not predictions of actual business revenue.

Not evaluated in this version

Economic impact (jobs, income, multiplier effects), fiscal impact (tax revenue, municipal cost), property-value effects, trail-related analysis, broader network connectivity, environmental effects, and comparable-places benchmarking are not computed in this version of the analysis. The trail module explicitly does not apply here, as the project is classified as a street multimodal project without trail facilities. These analyses are deferred for future versions.