# Opal Lake

Opal Lake is a lake in [Otsego Lake Township](https://ontology.bommaritollc.com/id/01a0ca47-784d-71ad-9629-5ff0032d5463), [Otsego County](https://ontology.bommaritollc.com/id/01a0ca47-5dbc-76a7-9cd6-a55d33bece50), [Michigan](https://ontology.bommaritollc.com/id/01a0ca47-57ff-7219-9e2f-cdc1b39bd0fa) (50.6 ha), in the [North Branch Au Sable River (HUC10 0407000702)](https://ontology.bommaritollc.com/id/01a0de92-1e41-7775-935e-254be29a1796) watershed.

IRI: <https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c14f3b01fdd7>

Within: [Michigan](https://ontology.bommaritollc.com/id/01a0ca47-57ff-7219-9e2f-cdc1b39bd0fa) › [Otsego County](https://ontology.bommaritollc.com/id/01a0ca47-5dbc-76a7-9cd6-a55d33bece50) › [Otsego Lake Township](https://ontology.bommaritollc.com/id/01a0ca47-784d-71ad-9629-5ff0032d5463)

Type: [geo:Feature](http://www.opengis.net/ont/geosparql#Feature), [schema:LakeBodyOfWater](https://schema.org/LakeBodyOfWater), [schema:Place](https://schema.org/Place)

Location: 44.92594, -84.61248 (box -84.61665, 44.92047, -84.60859, 44.93252; west, south, east, north)

- `adms:identifier`: [gnis 634076](https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c1586a153cc1)
- `dcterms:type`: [lake](https://ontology.bommaritollc.com/vocab/geo/gnisLake)
- `geo:hasDefaultGeometry`: [shape of Opal Lake](https://ontology.bommaritollc.com/id/01a0de2c-d1f1-73e6-a210-468abb44c63b)
- `geo:hasGeometry`:
  - [point of Opal Lake](https://ontology.bommaritollc.com/id/01a0ddfe-fb37-730f-ba10-b29d5a258367)
  - [shape of Opal Lake](https://ontology.bommaritollc.com/id/01a0de2c-d1f1-73e6-a210-468abb44c63b)
- `geo:hasMetricArea`: 506119.7 (xsd:double)
- **in watershed** (`bcgeo:inWatershed`): [North Branch Au Sable River (HUC10 0407000702)](https://ontology.bommaritollc.com/id/01a0de92-1e41-7775-935e-254be29a1796)
- `prov:wasDerivedFrom`:
  - [evidence from https://prd-tnm.s3.amazonaws.com/StagedProducts/GeographicNames/DomesticNames/DomesticNames\_MI\_Text.zip](https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c14ee9b3358d)
  - [evidence from https://3dhp.nationalmap.gov/arcgis/rest/services/usgs\_3dhp\_all/FeatureServer](https://ontology.bommaritollc.com/id/01a0de32-5778-709f-a651-c0b3d3cb5ca1)
  - [evidence from https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer](https://ontology.bommaritollc.com/id/01a0de92-1803-7303-9b50-f00bbfd45585)
- `schema:containedInPlace`:
  - [Otsego County](https://ontology.bommaritollc.com/id/01a0ca47-5dbc-76a7-9cd6-a55d33bece50)
  - [Otsego Lake Township](https://ontology.bommaritollc.com/id/01a0ca47-784d-71ad-9629-5ff0032d5463)
- `skos:prefLabel`: Opal Lake

## Elsewhere

- [Wikidata Q33295995](https://www.wikidata.org/wiki/Q33295995) (proposed match (exactMatch))
- [USGS GNIS 634076](https://edits.nationalmap.gov/apps/gaz-domestic/public/summary/634076) (gnis)
- [OpenStreetMap](https://www.openstreetmap.org/?mlat=44.92594&mlon=-84.61248#map=14/44.92594/-84.61248) (44.92594, -84.61248)
- [Google Maps](https://www.google.com/maps/search/?api=1&query=44.92594,-84.61248)
- [Source](https://prd-tnm.s3.amazonaws.com/StagedProducts/GeographicNames/DomesticNames/DomesticNames_MI_Text.zip) (prd-tnm.s3.amazonaws.com)
- [Source](https://3dhp.nationalmap.gov/arcgis/rest/services/usgs_3dhp_all/FeatureServer) (3dhp.nationalmap.gov)
- [Source](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer) (hydro.nationalmap.gov)

## Pointing here

- Mappings (1; `owl:annotatedSource`):
  - [exactMatch http://www.wikidata.org/entity/Q33295995 (proposed)](https://ontology.bommaritollc.com/id/01a0ddff-76b9-7039-84de-3850d144644d)

---
Also as: [Turtle](https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c14f3b01fdd7.ttl), [JSON-LD](https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c14f3b01fdd7.jsonld), [N-Triples](https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c14f3b01fdd7.nt), [HTML](https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c14f3b01fdd7)
Cite as: Opal Lake. bc-ontology, release 0.1.0-rc15, 2026-09-28. https://ontology.bommaritollc.com/id/01a0ddfe-c28c-7558-aa60-c14f3b01fdd7
Release 0.1.0-rc15, graph hash 90961d0d6b29954f5f0257ebc2d1d12c6ce580def6a2f45cbf04d248aa879e72.