{"meta":{"generated":"2026-07-25","method":"Boardings at a proposed station are predicted from the population measured around it, using rates fitted to a real operating rail system whose station catchments were measured the same way, by the same code, at the same two radii. The model is boardings = walkRate × residents within half a mile + ringRate × residents between half a mile and two miles, fitted by least squares through the origin with both coefficients constrained non-negative.","caveats":["UTA rail stations are fed by a bus network and by transfers between rail lines. A corridor opening as a single line has neither, so the peer relationship is an upper bound on day one and the reader can scale it down.","The fit has no intercept, so a station with no measured population forecasts no boardings. That is deliberate: it keeps a rural park-and-ride from inheriting ridership it has no source for.","Population is 2020 Census. The corridor has grown since, so the forecast is against a population that no longer exists — the smaller one.","The proposal itself states no ridership figure and makes ridership a Phase I performance gate. This is a projection built from measurement, not a target lifted from the proposal."]},"peer":{"agency":"Utah Transit Authority","source":"Utah Transit Authority, \"UTA Stops and Most Recent Ridership\" — average weekday boardings and alightings per platform, published through the Utah SGID.","url":"https://services1.arcgis.com/yznraL2FyB2Sm732/arcgis/rest/services/UTA_Stops_and_Most_Recent_Ridership/FeatureServer/0/query","censusSource":"U.S. Census Bureau TIGERweb, Census 2020 Blocks layer (POP100, HU100, INTPTLON/INTPTLAT) — the same layer and fields used for the Idaho corridor.","platforms":125,"stations":71,"groups":{"frontrunner":{"id":"frontrunner","label":"FrontRunner","description":"UTA’s regional rail spine, Ogden to Provo — one line running beside I-15 between separate cities, reached mostly by car. 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A mature network with a bus system feeding it — what a corridor becomes, not what it opens as.","fit":{"walkRate":0.024558,"ringRate":0.01438,"stations":57,"uncentredR2":0.6496,"rmse":698,"observedWeekdayBoardings":55296,"fittedWeekdayBoardings":52420},"stations":[{"name":"Stadium Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.852174,40.759706],"weekdayBoardings":2976,"walkPopulation":4922,"ringPopulation":66319},{"name":"University Medical Center","city":"Salt Lake City","systems":["TRAX"],"point":[-111.838852,40.76954],"weekdayBoardings":2282,"walkPopulation":3724,"ringPopulation":36447},{"name":"Trolley Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.87304,40.760668],"weekdayBoardings":2274,"walkPopulation":8856,"ringPopulation":70958},{"name":"Murray Central Station","city":"Murray","systems":["TRAX"],"point":[-111.895792,40.659886],"weekdayBoardings":2018,"walkPopulation":1006,"ringPopulation":60021},{"name":"Airport Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.982741,40.784312],"weekdayBoardings":2016,"walkPopulation":0,"ringPopulation":2794},{"name":"West Valley Central Station","city":"West Valley City","systems":["TRAX"],"point":[-111.959375,40.694364],"weekdayBoardings":1910,"walkPopulation":4766,"ringPopulation":69834},{"name":"Central Pointe Station","city":"South Salt Lake","systems":["TRAX"],"point":[-111.896849,40.724105],"weekdayBoardings":1868,"walkPopulation":1254,"ringPopulation":48264},{"name":"City Center Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.891091,40.767834],"weekdayBoardings":1840,"walkPopulation":6830,"ringPopulation":68626},{"name":"North Temple Bridge/Guadalupe","city":"Salt Lake City","systems":["TRAX"],"point":[-111.904757,40.771582],"weekdayBoardings":1800,"walkPopulation":6299,"ringPopulation":65983},{"name":"Library Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.884449,40.76064],"weekdayBoardings":1772,"walkPopulation":7357,"ringPopulation":75356},{"name":"Daybreak Parkway Station","city":"South Jordan","systems":["TRAX"],"point":[-112.014105,40.544094],"weekdayBoardings":1770,"walkPopulation":3229,"ringPopulation":49547},{"name":"University South Campus Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.839561,40.760297],"weekdayBoardings":1638,"walkPopulation":858,"ringPopulation":52885},{"name":"Salt Lake Central Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.90855,40.762198],"weekdayBoardings":1614,"walkPopulation":3471,"ringPopulation":69925},{"name":"Courthouse Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.891084,40.759149],"weekdayBoardings":1474,"walkPopulation":4646,"ringPopulation":78800},{"name":"Arena Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.900599,40.769343],"weekdayBoardings":1344,"walkPopulation":6829,"ringPopulation":67406},{"name":"Jackson/Euclid Station","city":"Salt Lake City","systems":["TRAX"],"point":[-111.914924,40.771503],"weekdayBoardings":1324,"walkPopulation":4911,"ringPopulation":63135},{"name":"1940 W. 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