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Cox Hollow Number Two Dam, Wisconsin
Cox Hollow Number Two Dam on Mill Creek in Wisconsin.
Open in BirdTrout43.025284, -90.083598 · Iowa County · NID WI00013. Tap the map to open this water in the live app.
What the runs do here
Mill Creek carries no anadromous run on our corridor map, so this page makes no claim about salmon or steelhead at this dam. What it sits on is coldwater — resident trout water — and the section below says which classification says so.
The structure
- Owner
- Wisconsin Department of Natural Resources State
- Purpose
- Recreation
- Completed
- 1965 · modified 1966O
- Type
- Earth
- Height
- 55 ft
- Length
- 630 ft
- Spillway
- Controlled, 4 ft wide
- Storage
- 5,370 acre-ft · 152 acre pool
- Drainage
- 14 sq mi
- Condition
- Fair · High hazard potential
From the National Inventory of Dams (USACE). Hazard potential is a downstream-consequence classification, not a statement about the structure's condition.
The water above and below
- Mill Creek 0.0 mi from the dam · Class II · wild supplemented (WDNR) · typed Cold
Coldwater designation is the state's own classification. A dam sits on one river and this list is every designated reach within a mile and a half of it, so a tributary mouth shows up here too.
Water right now
No USGS temperature gauge we read reports within 20 miles of this dam, so this page has no live number for it. That is a gap in the gauge network, not a judgement about the water.
Getting to it
The dam sits on or beside public land, SDNR.
- Twin Valley Lake Launch 0.5 mi · boat launch · Twin Valley Lake
- Cox Hollow Lake Access 1.8 mi · boat launch · Cox Hollow Lake
Public access sites near the dam, straight-line distance. A dam itself is private property unless its owner says otherwise; these are the places the state lists as open.
Fly shops nearby
- Fontana Sports 34.6 mi · Madison