Joy Maphis v. City of Boulder, Colorado, 2022 CO 10

On April 8, 2017, Joy Maphis tripped on a 2.5-inch vertical deviation in a Boulder residential sidewalk and suffered serious injuries (fractured elbows, facial injury).
City personnel had flagged the slab during a routine inspection weeks earlier and scheduled it for repair; repairs were completed two days after Maphis’s fall.
The City’s repair standard treats deviations greater than 3/4 inch as a “hazard”; the slab here was ~3× that threshold and its coloration made the lip hard to detect.
At a Trinity hearing the district court found the deviation was largely imperceptible, constituted an unreasonable risk, and denied the City’s C.R.C.P. 12(b)(1) motion (waiving immunity).
A divided Colorado Court of Appeals reversed, holding the undisputed facts did not show the risk “exceeded the bounds of reason.”
The Colorado Supreme Court affirmed the court of appeals: under the CGIA the sidewalk deviation did not constitute a “dangerous condition,” so municipal immunity remained intact.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether the sidewalk deviation constituted a "dangerous condition" under the CGIA (i.e., an "unreasonable risk")	Maphis: 2.5-inch, imperceptible lip (3× city "hazard" threshold) known to City and scheduled for repair made the condition unreasonably risky	City: although risky, the condition did not "exceed the bounds of reason" — common sidewalk deviations, residential location, no citizen complaints, identified only shortly before repair	Held: The undisputed evidence did not show the risk exceeded the bounds of reason; no waiver of immunity.
Standard of review for CGIA immunity questions	Maphis: district court factual findings supported waiver (relied on trial court’s factual conclusions)	City: legal question reviewed de novo; appellate court properly reviewed whether facts establish a dangerous condition	Held: Mixed question — factual findings reviewed for clear error; whether facts constitute a "dangerous condition" is a legal question reviewed de novo; the Court reviewed de novo and affirmed no waiver.

City & Cty. of Denver v. Dennis, 418 P.3d 489 (Colo. 2018) (defines "unreasonable" risk as one that "exceeds the bounds of reason" and explains CGIA standard)
Trinity Broadcasting of Denver, Inc. v. City of Westminster, 848 P.2d 916 (Colo. 1993) (procedure for resolving jurisdictional facts in CGIA immunity hearings)
City & Cty. of Denver v. Crandall, 161 P.3d 627 (Colo. 2007) (plaintiff bears burden at Trinity hearing to prove jurisdictional facts supporting waiver)
St. Vrain Valley Sch. Dist. RE-1J v. Loveland, 395 P.3d 751 (Colo. 2017) (discusses mixed-question review and statutory interpretation in immunity context)
Medina v. State, 35 P.3d 443 (Colo. 2001) (failure to warn alone does not trigger CGIA waiver)
Daniel v. City of Colo. Springs, 327 P.3d 891 (Colo. 2014) (notes CGIA’s purpose to permit recovery in circumstances statutorily identified while protecting public resources)