Compare 2 documented access options before you commit to a shoreline or launch.
View access →Montana lake guide
Horseshoe Lake — Thompson Chain Fishing
Horseshoe Lake is a deep Thompson Chain lake with an FWP launch, camping, and a mix of warmwater fishing opportunities. Its steep depth change and state-park access make it useful for both boat and shore-oriented trips.
LocationLincoln County, Montana
Primary targetsSmallmouth Bass
Best seasonSpring and fall
Lake size137 acres
Max depth134 feet
Access2 documented options
Guide reviewed
Start here
Plan Horseshoe Lake — Thompson Chain in 60 seconds
Make the trip decisions first. Use the deeper lake science, surveys, stocking history, and source material below when you want more detail.
Start with the documented species list, then open a species guide for seasonal behavior and practical tactics.
Choose a fish →Use verified depth information to identify basins, breaks, points, channels, and other structure before you fish.
View depth information →Wind, rain, temperature, and changing access can alter the plan quickly. Check current conditions before leaving.
Check conditions →Lake details
Depth, size & key facts
Average depth44 feet
Max depth134 feet
Elevationabout 3,351 feet
Public launches1
Summer cautionWind
Lake depth map
Depth contours may take a little time to load. Sorry for the inconvenience.
Contour line20 ft Visible depth label
Source: Montana Fish, Wildlife & Parks. Historical survey data may not reflect current water levels or underwater hazards. Informational only; not for navigation.
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Trip conditions
Current conditions
Loading the local forecast. Check access and official notices before leaving.
TodayLoading
WindLoading
GustsLoading
Rain chanceLoading
Four day outlook
Tools
Today's Lure Pick
Open Tools for species-specific lure guidance.
Official depth chart
Official static bathymetry
Interactive contours available
Horseshoe Lake — Thompson Chain official depth chart
Open the official depth publication to inspect the lake chart. This static survey complements interactive contours when available and should not be used as a navigation chart.
Fishery record
Documented fish species
These species come from the lake record. Open a species guide for identification, seasonal behavior, and practical tactics without confusing general species guidance with a lake-specific survey result.
Bass and sunfish
Smallmouth Bass
Focus on rock, points, breaks, and transitions.
View species guide
Bass and sunfish
Pumpkinseed
See cover, seasonal movement, presentations, and practical gear tips.
View species guide
Perch and pike
Tiger Muskie
See depth, structure, seasonal movement, and presentation tips.
View species guide
Fishery intelligence
Official fishery evidence
Agency survey records and measured fishery data, distilled for trip planning.
8
verified signals
Research & surveys
Agency-backed record
Use the evidence
Turn records into a fishing plan
- Compare survey evidence with the seasonal guide.
- Use the map to connect depth, access, and structure.
- Confirm current rules and access before your trip.
Angler interpretation
How the fishery changes through the seasons
This is the practical layer: use it alongside the documented species, depth, stocking, survey, access, and regulation record above. The current season opens first.
Spring
bass- Start here
- Cooler water, recent stocking, fish moving shallow, and protected shorelines or inlets that warm first.
- Watch for
- Cold fronts, changing water levels, muddy inflow, and early-season ramp conditions.
Summer
bass, panfish- Start here
- Fish early or late, then adjust toward deeper water, shade, vegetation, or comfortable temperature zones.
- Watch for
- Wind, weeds, algae, heat, and heavier boat traffic.
Fall
bass, muskie- Start here
- Cooling water, shoreline structure, points, weed edges, and simple presentations that let you cover water.
- Watch for
- Wind on open water, rapidly changing weather, and shorter daylight windows.
Winter
listed species- Start here
- Legal open-water or ice access, stable depth zones, and conservative cold-weather trip plans.
- Watch for
- Ice safety where relevant, ramps, road conditions, cold-water exposure, and current rules.
Quick answers
Horseshoe Lake — Thompson Chain fishing questions
Answers to common fishing questions that go beyond the four trip-planning decisions above.
When is the best time to fish Horseshoe Lake — Thompson Chain?
The Thompson Chain is a recognized ice-fishing area; verify safe ice, snow, and primitive-road conditions before a winter trip.
See seasonal guidance →Is a depth map or bathymetry available for Horseshoe Lake — Thompson Chain?
Verified official Montana FWP bathymetry chart; live FWP contour query also enabled. FishyNW only labels bathymetry as available when a source-backed map, chart, or contour resource is documented.
View map and bathymetry →Are there special fishing regulations for Horseshoe Lake — Thompson Chain?
Check current Montana Western District fishing rules and Thompson Chain State Park restrictions before fishing or boating.
Review regulations →Know before you go
Rules and restrictions
Check current Montana Western District fishing rules and Thompson Chain State Park restrictions before fishing or boating.
Getting on the water
Access and launches
Montana FWP identifies a public launch and campsites at Horseshoe Lake within Thompson Chain of Lakes State Park. The park says roads are primitive and can be unsuitable for large trailers or motor homes; verify current park restrictions and site conditions before towing.
Sorry, there are no mapped boat ramps for this lake yet. Check the access information below for other ways to reach the water.
More launch links
Official field updates Recent surveys and fishing pressure
Official surveys and pressure information can help with trip planning. Conditions change, and these updates do not guarantee current fishing.
Trout, Yellow perch
FishMT provides a Horseshoe Lake waterbody page with official size, elevation, directions, waterbody and survey data sections. Use as source-available planning context.
Trout, Yellow perch
Montana Fish, Wildlife & Parks FishMT source check includes fishery survey, sampling, or population context for Horseshoe Lake. This supports species planning for Trout, Yellow perch, not guaranteed success.
Trout, Yellow perch
FishMT lists Horseshoe Lake directions east of Bigfork plus official waterbody information. Use as access-planning context.
Trout, Yellow perch
FishMT Horseshoe Lake record and bathymetric/source context support a cautious small-lake planning signal. Verify current access and fishing rules before travel.
Explore by region or target
More ways to explore this fishery
Use FishyNW fishing hubs to compare this water with other relevant lakes and rivers without starting another search.
Keep exploring
Nearby waters
The four closest FishyNW lake guides by straight-line distance.
Murphy Lake
1.9 miles away · Lake
Targets include Rainbow Trout, Yellow Perch, Kokanee.
Dickey Lake 5.3 miles away · LakeTargets include Rainbow Trout, Kokanee, Yellow Perch.
Glen Lake 8.7 miles away · LakeTargets include Kokanee, Rainbow Trout, Yellow Perch.
Lake Koocanusa 18.8 miles away · LakeTargets include Rainbow Trout, Kokanee, Bull Trout.
Did you know?
What makes Horseshoe Lake — Thompson Chain distinctive
Horseshoe Lake — Thompson Chain reaches about 134 feet at its deepest documented point.
Horseshoe Lake — Thompson Chain sits at roughly 3,351 feet in elevation, so seasonal access and water temperature can differ sharply from lowland lakes.
Horseshoe Lake — Thompson Chain is documented in Lincoln County County with a dedicated FishyNW fishing and access profile.
Research & monitoring
Water science & monitoring
Loading available public monitoring and fishery science. Use this as supporting research, not as a live fishing report.
Pass 3 · depth + water column
Seasonal Fish Habitat
Surface · 0 ft
How to read this data
Temperature, dissolved oxygen, clarity, nutrients, chlorophyll-a, pH, and conductivity are observations from public monitoring records and may be historical. Thermocline depth is shown only when FishyNW can derive a strong vertical temperature gradient from a measured profile. It is not treated as a permanent lake characteristic.
Trophic indication uses the Carlson Trophic State Index only when FishyNW can normalize a measured chlorophyll-a, Secchi, or total-phosphorus value. It is a derived ecological indicator, not an agency impairment determination.
Seasonal Fish Habitat is shown only when verified bathymetry overlaps a same-day, same-station temperature and dissolved-oxygen profile. It is a historical screening snapshot, not a live prediction of where fish are located.
For lake trout, FishyNW uses the broader USGS-tested screening combination of water at or below 15°C (59°F) and dissolved oxygen at or above 4 mg/L. For other coldwater species, FishyNW does not invent a preferred-temperature threshold; it shows only the observed thermocline-to-oxygenated-depth refuge when the evidence supports it.
Harmful-algae status is never inferred from missing data. Always check the linked state source for current advisories before contact recreation.
Open matched Water Quality Portal recordsSources & feedback
Verified resources
Official links for this lake
Open the source that matches what you are planning.
Community feedback
See something that needs an update?
Send the correction and, when possible, the source. FishyNW reviews submissions before changing the guide.