Monarch Lake

{{Use mdy dates|date=December 2022}}

{{Infobox body of water

| name = Monarch Lake

| image = Monarch Lake.JPG

| alt =

| caption = The lake in October 2022

| location = Grand County, Colorado

| group =

| coordinates = {{coord|40|6|20.62|N|105|44|30.57|W|region:US-CO_type:waterbody|display =inline,title}}{{cite gnis |178465 |Monarch Lake | |December 31, 1981}}

| type = Reservoir

| etymology =

| part_of =

| inflow = Arapaho Creek

| rivers =

| outflow = Arapaho Creek

| oceans =

| catchment =

| basin_countries = United States

| agency = United States Forest Service

| designation =

| date-built = {{Start date|1929|}}

| engineer =

| date-flooded =

| length =

| width =

| area =

| depth =

| max-depth =

| volume = {{convert|2000|acre.ft|abbr=off|sp=us}}

| residence_time =

| salinity =

| shore =

| elevation = {{convert|2542|m|ft|abbr=off|sp=us}}

| temperature_high =

| temperature_low =

| frozen = Freezes in winter.

| islands =

| islands_category =

| sections =

| trenches =

| benches =

| cities =

| pushpin_map = Colorado

| pushpin_label_position = top

| pushpin_map_alt =

| pushpin_map_caption = The lake's location in Colorado

| website = {{URL|1=https://www.fs.usda.gov/recarea/arp/recarea/?recid=81813}}

| reference =

}}

Monarch Lake is a reservoir in Grand County, Colorado located within the Arapaho National Recreation Area. The reservoir is adjacent to the Indian Peaks Wilderness on its north and east sides. The Continental Divide National Scenic Trail passes along its south side,{{cite web |url=https://continentaldividetrail.org/cdnst-interactive-map/ |title=CDT Interactive Map |author= |date=n.d. |website=Continental Divide Trail Coalition |publisher= |access-date=October 20, 2022 |quote=}} and the trailhead at the west end of the lake also marks the beginnings or ends of several other popular hiking trails.{{cite web |url=https://www.fs.usda.gov/recarea/arp/recarea/?recid=28566 |title=Monarch Lake Trailhead |author= |date=n.d. |website=Arapaho & Roosevelt National Forests Pawnee National Grassland |publisher=USDA Forest Service |access-date=October 20, 2022 |quote=}}