How much farmland would Dayton’s proposed buffers idle? Iowa study finds ‘minuscule’ impact

Environmental Working Group’s report characterizes a stream buffer rule as the “low-hanging fruit” that Iowa can seize to quickly begin reversing the agricultural pollution of its waterways.

As Minnesotans await the fine print on Gov. Mark Dayton’s push to require runoff-filtering buffer strips at the borders of all state waters – and as various farm groups plot their lobbying campaign against it – a brand-new study from Iowa offers some important, ground-truthed findings on probable impacts.

Contrary to assumptions that a serious effort on buffers would heavily burden farmers by taking huge amounts of land out of production, says the report from the Environmental Working Group, aerial surveys and land-use analysis in five representative Iowa counties show that such a program would affect “only a handful of growers and a minuscule number of acres.”

The analysis considered the impact of 50-foot buffers, the size most frequently mentioned in discussion of Dayton’s initiative, but also a narrower and a wider alternative. Regardless of buffer size, the amount of land most farmers would have to idle was less than 1 acre out of holdings that averaged more than 125 acres.

  • Meeting a 35-foot requirement would affect only 8 percent of landowners. Of those affected, 85 percent would only need to convert an acre or less of cropland.
  • Requiring a 50-foot buffer would affect only 11 percent of landowners in the five counties, and 71 percent of them could meet that standard by converting a single acre or less.
  • Even implementing a 75 foot standard would affect only 13 percent of landowners, with 54 percent able to comply by converting a single acre or less.

It’s on the basis of that minimal disturbance that EWG’s report characterizes a stream buffer rule as the “low-hanging fruit” that Iowa can seize to quickly begin reversing the agricultural pollution of its waterways.

In laying out his proposal last month, Dayton said that establishing 50-foot buffers between cultivated fields and the state’s lakes, streams and rivers would mean conversion of about 125,000 acres from crops to grassy perennials.

That sounds like a lot of land, and so far as I can determine, nobody covering the story has yet probed below the surface of predictably agro-centric observations like the comments Doug Busselman, public policy director for the Minnesota Farm Bureau, shared with Sam Cook of the Duluth News Tribune.

Hardship for how many?

Paraphrasing Busselman, Cook reported his view “that the governor’s proposal would be a hardship for many of the group’s 30,000 members.”

Then, quoting him directly, Cook presented Busselman’s view that “In many cases where there are buffer requirements, now it’s 16½ feet and now you’d be going to 50 and that’s going to take considerable land out of production.”

“We have concerns over the one-size-fits-all nature of the governor’s particular proposal. …  There’s also a property rights issue that seems to be missed in all of this. It’s somewhat akin to the governor saying, ‘Let’s take the front 20 feet of your lawn and let anyone walk on it.’ ”

Some pretty good sloganeering there, I have to admit.

But I do hope that when Busselman and his allied ag lobbyists get their turn to testify at the Legislature on Dayton’s proposal, somebody offers them the opportunity to explain in some depth how such an apparently trivial burden on most Iowa farmers becomes so onerous when applied one state to the north.

Again, from the report:

The analysis showed that requiring a 50-foot buffer would affect only 11 percent of the landowners in those five counties – ranging from 8 percent in Linn County to 15 percent in Plymouth County. Moreover, only 0.12 percent of the corn and soybean row crop acreage would have to be replaced by permanent vegetation to meet a 50-foot requirement. Fully 71 percent of the affected landowners would only have to convert an acre or less to meet that standard.

In addition to Linn and Plymouth, the other counties studied (and scattered across Iowa) were Allamakee, Hamilton and Union; an interactive map is available here. Are the broad patterns of land ownership and farming practices so very different there than here?

If so, perhaps the Farm Bureau would like to go to school on EWG’s report and prepare its own detailed analysis. Why not collate aerial photography, GIS mapping data and land-ownership records to prove its case?

A law long ignored

Actually, there is one big difference between our state and Iowa on riparian buffers in agriculture, and it’s one that is actually highlighted by EWG as a point of Minnesota pride.

In our state, long-settled law already requires a 50-foot buffer – a “grass filter strip,” in the words of the Minnesota Department of Agriculture’s guidance page – where cropland meets a lake, stream or river.

Enforcement, however, is another matter – inconsistent across much of the state, virtually nonexistent in some areas.

(As for the 16½-foot buffer rule mentioned by Busselman, it actually applies to ditches, and only certain ditches; here, too, enforcement has fallen significantly short of vigorous. Should 16½ feet strike you as a peculiarly precise requirement, we are speaking here of a venerable land-measurement unit, the rod, which gives you an idea of the rule’s antiquity.)

An earlier EWG study, published last April, looked at a region of southern Minnesota and found that only 18 percent of waterways subject to the 50-foot buffer requirement were in full compliance with it. In nearly twice as many – 35 percent –less than 70 percent of the legally required buffer acreage was in place.

I suppose we can understand, without endorsing, the chagrin that some farmers will feel at finally being held to account on a requirement that has been so widely overlooked for so long.

Long enough that even the agriculture commissioner, Dave Frederickson, may have felt he was making a noncontroversial point at December’s pheasant summit when he suggested that it might be time to face reality and simply scrap the much-ignored rule.

Thankfully, his boss has decided to go in the opposite direction, and to transfer state-level responsibility for implementation and enforcement to the DNR. It’s about time.

Trends against conservation

Minnesota and Iowa both have seen considerable buffer land go back into crop production in recent years as farmers have taken it back out of the national Conservation Reserve Program and similar efforts.

In Minnesota, from 2006 to 2013, the Department of Natural Resources estimates that 600,000 acres of former CRP land went back into cultivation.

That’s right: Four times the amount of new buffer that Dayton’s proposal would take out of crop production has already gone back into production in less than a decade.

Both states, too, have serious and longstanding problems with phosphorus and nitrate pollution of public waterways from agricultural sources. In addition to the impacts on aquatic ecosystems — the growing problem of large blue-green algal blooms, for just one example — the degraded water quality imposes downstream treatment costs on communities that draw their drinking water from polluted sources.

As the EWG report says of Iowa, though it could say the same of Minnesota:

The prospect of enacting a streamside buffer standard raises the most important policy issue facing Iowans tired of dirty water: What’s fair to  expect landowners to do at their own cost as part  of the responsibilities that come with the rights of ownership?

Landowners are expected to be good citizens – to fence their cattle out of their neighbors’ land, control noxious weeds before they spread to others’ fields and make sure that their herbicide sprays don’t damage nearby crops.

Why shouldn’t there be a similar standard of care to protect those who live downstream? It is unfair and bad policy to expect taxpayers to foot the bill for everything that farm operations need to do to clean up Iowa’s streams and rivers.

Well said, but I feel that Mark Dayton has put it more succinctly, and memorably:

The land might be yours, but the water belongs to all of us.

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Comments (9)

  1. Submitted by Ray Schoch on 02/03/2015 - 09:46 am.


    Well said. The water belongs to all of us, and pollution affects downstream users indiscriminately, whether they want it to or not. Hunters, of which there are many in Minnesota, ought to be aware that this issue affects wildlife habitat as much as humans.

    Another point not mentioned has to do with erosion. I’ve read that a significant percentage of Iowa’s amazingly fertile soil has simply washed downstream, into the Des Moines and other rivers, and eventually into the Mississippi and the Gulf of Mexico. Southern Minnesota, at least, shares some of that soil bounty. I doubt that a 50-foot buffer would transform or completely stop soil loss, but it would certainly aid in slowing such loss, not only in Iowa, but in Minnesota, as well.

  2. Submitted by Joe Smithers on 02/03/2015 - 11:20 am.


    Dayton’s proposal is not nearly enough. He is on the right track but 50 ft would do nearly nothing to stop sediment. As far as the article I think it would be better to look at it as a percentage of ag land rather than percentage of owners. One owner can be affected more than others so who cares if 75 ft buffers affect 11 percent. If you want a giggle a farmer wrote in to the west central tribune last week about the proposal whining about how it would take so much land away and affect the economy. Ha. He and so many like him have no idea how much of their fields end up in the rivers, lakes and ocean and look at things with their huge blinders on so they don’t have to see the real effects.

  3. Submitted by chuck holtman on 02/03/2015 - 02:11 pm.

    Doug Busselman: “It’s somewhat akin to the governor saying,

    ‘Let’s take the front 20 feet of your lawn and let anyone walk on it.’ ”

    That seems like a bad analogy, since a buffer requirement doesn’t create a right of the public to enter your private property, it just requires that you leave a ribbon of your property uncultivated to protect the public waters from the impact of your cultivation.

    A better analogy would be something like a requirement that the house you build on your lot needs to be set back a certain distance from the lot line, to protect the public ways from the visual impact of your structure.

    Now that would be unreasonable! Oh, wait a minute …

    • Submitted by Joe Smithers on 02/04/2015 - 11:05 am.


      Still a poor analogy. Building setbacks are already observed by rural residents. The proposal would simply require them to leave it vegetated not add to a building setback or reduce visual impact of structures.

    • Submitted by Joe Smithers on 02/18/2015 - 01:35 pm.


      If you have had that area as lawn for 20+ years how exactly would you enforce that? Simple answer is that you can’t. Are you going to make every person that owns a house on a lake shore that is less than 50 feet away pick it up and move it back? Of course not. You and the governor have a lot to learn about how things work. People (not just farmers) willingly thumb their nose at the law when told in advance they can’t do something and the courts do nothing about it.

  4. Submitted by Tom Anderson on 02/03/2015 - 07:28 pm.

    Hardship for how many?

    Depends, how many people visit the sandy beaches on Minneapolis lakes? Or any lakes for that matter. Somehow that grassy strip might not be so easy to sink your toes into while you’re watching the kids swim or just soaking up the sun, unless you move back 50 feet to where there still might be sand.

    Jabbing that old forked stick into the foot high grass while fishing on the riverbank might not be so easy either.

    I’m not saying that Governor’s idea is bad, just that there will be a lot of people affected when there has to be a buffer strip at the border of ALL state waters.

    • Submitted by Joe Smithers on 02/04/2015 - 09:03 am.


      I’m not sure how he plans to implement it but I would assume lake shore owners and beaches would be exempt since no ag practices are taking place there. This would only affect owners of ag land so that there is some vegetation to stop erosion before the waters.

  5. Submitted by Joe Smithers on 02/17/2015 - 10:57 am.


    What does he plan to do with bermed ditches or ones with side inlets? It would obviously do zero good to buffer a ditch that is bermed to prevent runoff from going into it but more often than not those ditches also have side inlets that let runoff directly in. I don’t think he has thought things through completely.

  6. Submitted by Joe Smithers on 02/18/2015 - 03:47 pm.


    I find it more than just a little concerning that the first groups Dayton listened to were extreme environmental groups.

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